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A preliminary list of vascular plant species identified at the Fly Gap Division of Double Helix Ranch, Mason County, Texas. This list is a work in progress.

Family   Genus species Common name How ID'd or voucher Comments
             
Acanthaceae   Dyschoriste linearis Polkadots, snakeherb Hillis 06-634 Low, sprwading, with lavender flowers; P
Acanthaceae   Ruellia humilis Prairie Petunia, Fringeleaf Wild Petunia Hillis 02-365 Blooms April-August; flower light purple, trumpet-shaped, 2" across, last only one day; western range record; P
Agavaceae   Yucca constricta Buckley's Yucca field id Flower stalks often eaten by deer; blooms April-May; white flowers on talk stalk; P
Amaranthaceae   Froelichia gracilis Snake-cotton Hillis 74 Annual weedy herb
Amaranthaceae   Gossypianthus lanuginosus var. lanuginosus Cottonflower Hillis 26 Pubescent leaves, deep tap root; small greenish-white flowers; P
Amaryllidaceae   Cooperia drummondii Rain Lily Hillis 62 Blooms after rains, summer to early fall; white; 3 petals and three sepals, to 2"; P
Amaryllidaceae   Cooperia pedunculata Giant Rain Lily Hillis 07-718 Blooms after rains, spring to early summer
Anacardiaceae   Rhus lanceolata Flame-leaf Sumac field id Not nearly as common on Fly Gap's sands as on limestone to the east; mostly along streams; P
Anacardiaceae   Rhus toxicodendron Poisson Ivy field id Not abundant; deer probably keep in check; P
Anacardiaceae   Rhus trilobata Skunkbush Sumac Hillis 03-442 Hillsides; P
Apiaceae   Chaerophyllum tainturieri Hairyfruit Chervil field id Small 5-petaled white flowers; A
Apiaceae   Eryngium diffusum Spreading Eryngo, false thistle Hillis 40 Light lavender, thistle-like flower;
Apiaceae   Spermolepis echinata Bristly Scaleseed Hillis 198 Tiny white flowers; grows in cracks of boulders; A
Apiaceae   Torilis arvensis Beggar's Ticks Hillis 02-235 Produces obnoxius seeds that stick to socks and pant legs; introduced
Apocynaceae   Amsonia ciliata var. texana Texas Bluestar Wendt 7151, Hillis 108 Blooms late March-June; light blue, ring of white in center, 5 petal-like lobes in star shape 0.5" wide; P
Asclepiadaceae   Asclepias asperula Spider Milkweed Hillis 144 Blooms late spring through fall; green-white flowers in ball shaped head 3-4" wide; P
Asclepiadaceae   Asclepias oenotheroides Zizotes Milkweed Hillis 02-237  
Asclepiadaceae   Asclepias     Hillis 07-716  
Asclepiadaceae   Asclepias verticellata Whorled Milkweed Hillis 02-314  
Asclepiadaceae   Cynanchum racemosum var. unifarium Talayote Hillis 18 Climbing vine; tiny yellow flowers; white sap; May-Oct
Asclepiadaceae   Matelea cynanchoides Prairie milkvine Hillis 172 Purple-brown flower; plant smells like burned rubber; range extension from the north and east
Asclepiadaceae   Matelea reticulata Net-vein milkvine Hillis 199 Green flower
Asteraceae   Achillea millefolium Common Yarrow Hillis 189 Blooms March-July; clusters of flower heads with 20-25 small white to yellowish rays; P
Asteraceae   Ambrosia psilostachya Western Ragweed Hillis 05-627 Common in fields in late summer and fall; P
Asteraceae   Ambrosia trifida Giant Ragweed Hillis 04- Mostly along Fly Gap road; A
  Asteraceae   Aphanostephus skirrhobasis var. skirrhobasis Lazy Daisy, Arkansas Dozedaisy Simpson 14-IV-01-5 (Det BLT); Hillis 19 Abundant (deer staple in spring); blooms Mar-Jul; white rays, yellow disk; 1-2"; A
Asteraceae   Calymmandra candida Silver Pygmycudweed Wendt 7171 syn. Evax candida; W extreme of range, sandy
Asteraceae   Calyptocarpus vialis Hierba del Caballo Hillis 05-610 Yellow flower, trailing stems; summer; P
Asteraceae   Chaetopappa asteroides Arkansas Leastdaisy Hillis 91, Simpson 14-IV-01-4 (Det BLT) Mar-Jun; A
Asteraceae   Cirsium texanum Texas Thistle Hillis 219 Apr-Aug; purple; B/P
Asteraceae   Cirsium undulatum Wavyleaf Thistle Hillis 21 May-Jul; P
Asteraceae   Cirsium     Hillis 02-290  
Asteraceae   Coreopsis tinctoria Plains Coreopsis field id late April-July; yellow rays, brownish red toward disk; brown disk 8 mm, rays about 8 mm; A
Asteraceae   Coreopsis wrightii Rock Tickseed Hillis 6 late April-July; yellow rays, brownish red toward disk; brown disk 5 mm, rays about 15 mm; A
Asteraceae   Coreopsis     Hillis 12-767 yellow ray flowers, no proximal brownish red; A
Asteraceae   Coreopsis     Hillis 12-768 taller than other Coreoposis on ranch; 150 cm; A
Asteraceae   Dyssodia pentachaeta Fiveneedle Pricklyleaf Hillis 137 Blooms April-November; many yellow flower heads (0.5" wide) with produding yellow disk; P
Asteraceae   Dyssodia tenuiloba var. tenuiloba Bristleleaf Pricklyleaf Hillis 22 Mar-Jun and Sep-Nov; yellow rays and disk; A/P
Asteraceae   Erigeron tenuis Fleabane Daisy Simpson 14-IV-01-6 (Det BLT) Blooms Mar-Aug; many fine white rays, yellow disk; lots of flower heads, 0.5-0.75" wide; P
Asteraceae   Gaillardia pulchella var. pulchella Indian Blanket, Firewheel Hillis 10, 05-599 Abundant late spring; late April-June (less common through summer); rays red, yellow distally; disk brown; 1.5-2" wide; A (The form collected at Fly Gap--without yellow on rays--is common in the Llano Uplift area.)
Asteraceae   Gamochaeta pensylvanica Pennsylvania Everlasting Simpson 14-IV-01-18 W edge of range, sandy
Asteraceae   Gutierrezia dracunculoides Common Broomweed Hillis 05-628 Blooms June-Oct; mostly in NE corner; numerous small yellow flowers; deer eat but cattle don't; P
Asteraceae   Helenium amarum var. badium Bitterweed Hillis 12 Bitter taste and strong smell; yellow rays, brown disk; spring-summer; A
Asteraceae   Helianthus annuus Common Sunflower field id Deer eat flower buds, birds love seeds; blooms Jun-Nov; yellow rays, brown disk, 3-6" wide; A
Asteraceae   Helianthus annuus x petiolaris? Sunflower fragment ID'd by BLTurner Billie Turner identified; yellow rays and disk; growing with H. annuus; need better material; A
Asteraceae   Hymenopappus scabiosaeus Old Plainsman Hillis 02-220 Fall bloomer; sandy fields; white flowers; B
Asteraceae   Krigia cespitosa Weedy Dwarfdandelion Hillis 02-284 W edge of range; A
Asteraceae   Krigia occidentalis Dwarf Dandelion Simpson 14-IV-01-1 (Det BLT) W extreme of range, sandy; A
Asteraceae   Lactuca serriola Prickly lettuce Hillis 8 Introduced weed; small yellow flowers; A
Asteraceae   Liatris punctata Gayfeather Hillis 06-669 Fall blooming, purple spike; P
Asteraceae   Lygodesmia texana Texas Skeleton Weed Hillis 203 late April-Sep; lavender, 12 ray flowers
Asteraceae   Palafoxia rosea Rose Palafoxia Hillis 06-664 blue-violet flowers; A
Asteraceae   Pseudognaphalium sp. Cudweed Hillis 41 Wolly leaves; A. (Specimen is sterile and galled; I assume that it is this genus.)
Asteraceae   Ratibida columnifera Upright Prairie Coneflower, Mexican hat Hillis 20 Blooms May-July; rays orange, tips yellow; protruding disk green to brown; heads 2" wide; P
Asteraceae   Rudbeckia hirta Brown-eyed Susan Hillis 15 2-toothed yellow rays w/brown base; brown disk; A/P (extreme W of range)
Asteraceae   Senecio ampullaceus Texas Groundsel Wendt 7162, Hillis 101, 112, 120, 121 W extreme of range; blooms March-May; yellow rays and disk; 7-9 rays per flowerhead; 1"; A
Asteraceae   Solidago   Goldenrod Hillis 06-671 Fall bloomer; yellow flowers; P
Asteraceae   Sonchus oleraceus Sow Thistle Hillis 9 Introduced weed.
Asteraceae   Symphyotrichum divaricatum Slim Aster Hillis 60 (Det BLT) white rays, yellow disk
Asteraceae   Symphyotrichum ericoides Heath Aster Hillis 05-626 (Det BLT) white rays, yellow disk; P
Asteraceae   Tetraneuris sp. Bitterweed field id  
Asteraceae   Thelesperma filifolium Greenthread Wendt  
Asteraceae   Verbesina encelioides Cowpen Daisy Hillis 7 Yellow-orage ray flowers (3 lobed), large protruding yellow-orange disk; A
Asteraceae   Vernonia baldwinii Western Ironweed Hillis 06-661 Purple flowers; grows in open wooded areas under trees along Fly Gap Rd.; P
Asteraceae   Xanthisma texanum var. drummondii Sleepy-Daisy Hillis 5, 85 Apr-Nov; yellow rays and disk; A
Berberidaceae   Berberis trifoliolata Agarita field id Blooms Feb-Apr; flower yellow, red fruit in June; favorite of birds; P
Boraginaceae   Cryptantha texana Pick Me Not Simpson 14-IV-01-10, Hillis 138 W edge of range, sandy; blooms Mar-Jun; white flowers; A
Boraginaceae   Lithospermum incisum Puccoon Simpson 14-IV-01-11 corolla lobes almost entire, unusual for sp.; Mar-Jun; cluster of tubular yellow flowers (1" w); P
Brassicaceae   Arabis petiolaris Brazos Rockcress Hillis 07-720 Texas endemic; fruits 40-80 mm long, 3-4 mm wide; A
Brassicaceae   Brassica nigra Black Mustard field id  
Brassicaceae   Capsella bursa-pastoris Shepherd's Purse Hillis 99, 123  
Brassicaceae   Descurainia pinnata Tansy-Mustard Simpson 14-IV-01-16, Hillis 111; Hillis 07-685 Yellow flowers; A
Brassicaceae   Lepidium virginicum Peppergrass, Lentejilla Simpson 14-IV-01-15, Hillis 110  
Brassicaceae   Lesquerella densiflora Bladder-pod Simpson 14-IV-01-17, Hillis 100, 113, 139,140 Blooms March-April; yellow flowers, round bladder-like fruits
Brassicaceae   Rapistrum rugosum Turnip weed Hillis 105, 130, 136 pernicious introduced weed; trying to eradicate; kill at sight; blooms Mar-Jun; yellow
Brassicaceae   Rorippa nasturtium-aquaticum Water cress Hillis 05-573 White flowers; common along north stream and Annex Spring
Bromeliaceae   Tillandsia recurvata Ball Moss Hillis 02-333 At edge of range; mostly in large oaks near creeks; P
Buddlejaceae   Polypremum procumbens Juniper Leaf Hillis 02-393, 03-463, 03-500, 04-552 Small white, four-petalled flowers; grows along seasonal creeks; A/P
Cactaceae   Coryphantha sulcata Nipple cactus field id Flower red basal, yellow distal; April; P
Cactaceae   Coryphantha vivipara Pincushion cactus field id  
Cactaceae   Echinocereus coccineus Claret Cup cactus Panero # Blooms early to mid April; red; P
Cactaceae   Echinocereus reichenbachii Lace cactus field id Often blooms synchonously; April-May; pink-purple flowers; P
Cactaceae   Hamatocactus bicolor Hedgehog cactus field id  
Cactaceae   Mammillaria heyderi Little Chilis cactus field id  
Cactaceae   Opuntia engelmannii Texas Prickly Pear Hillis 02-279 Fruit, pods, and yellow flowers eaten by deer (important soft mast crop); yellow spines, globular fruit; fruit ripe Aug-Oct.; P
Cactaceae   Opuntia davisii Cholla field id Not common; a few scattered individuals in area
Cactaceae   Opuntia leptocaulis Turkey Pear, X-mas cactus Hillis 02-294 Fruit favorite of quail, turkeys; also called Tasajillo; red fruits persistent, blooms in spring; P
Cactaceae   Opuntia macrorhiza Plains Prickly Pear Hillis 05-629 Less common than O. engelmannii; white spines, spreading; club-shaped fruit; P
Cactaceae   Opuntia phaeacantha Brown-spined Prickly Pear field id  
Callitrichaceae   Callitriche heterophylla Two-headed Water-Starwort Hillis 03-468, 05-582 Grows in mats along pond shore; A/P
Campanulaceae   Triodanis perfoliata Venus' Looking Glass Wendt Blooms April-June; 5 lavender petals (early flowers have 3-4 short petals)
Caryophyllaceae   Cerastium brachypodum Mouse-ear Simpson 14-IV-01-2, Hillis 05-569 W edge of range
Caryophyllaceae   Paronychia lindheimeri Forked Nailwort Hillis 02-417 Minute yellow flowers; low, spreading forb; A/B
Caryophyllaceae   Sagina decumbens Pearlwort Simpson 14-IV-01-3 W extreme of range, sandy
Chenopodiaceae   Chenopodium leptophyllum Slim-leaf Goosefoot Hillis 06-668 Disturbed area; A
Cistaceae   Helianthemum georgianum Rockrose Wendt, Hillis 202, 02-375, 04-553 Rocky slopes; small greenish-yellow flowers.
Cistaceae   Lechea san-sabeana San Saba Pinweed Hillis 03-537, 04-548 Rust and green flowers; abundant in open fields; east-central Texas endemic; P
Commelinaceae   Commelina erecta Day Flower (Hierba Del Pollo) Hillis 58 May-Oct; 2 large blue petals, one tiny white petal; P
Commelinaceae   Tradescantia gigantea Giant Spiderwort Hillis 07-684 Sepal hairs eglandular, longer internodes than T. occidentalis; blue to violet flowers; Mar-May; P
Commelinaceae   Tradescantia humilis Texas Spiderwort Panero #  
Commelinaceae   Tradescantia occidentalis Western Spiderwort Wendt 7157, 7157A, Simpson 14-IV-01-9; Hillis 07-686 Sepal hairs glandular; variable flower color &veg. pubescence, check; Mar-May; blue to violet; 3 petals, 3 sepals; P
Convolvulaceae   Convolvulus equitans Texas Bindweed Hillis 180, 181, 182, 183  
Convolvulaceae   Cuscuta sp. Dodder Hillis  
Convolvulaceae   Dichondra recurvata Recurved Pony-foot Hillis 196 Grows in partial shade of oaks
Convolvulaceae   Evolvulus nuttallianus Shaggy Dwarf Morning-glory Hillis 03-488 P
Convolvulaceae   Evolvulus sericeus White Dwarf Morning-glory Hillis 23  
Convolvulaceae   Ipomoea lindheimeri Lindheimer's Morning Glory Hillis 02-  
Convolvulaceae   Ipomoea cordatotriloba Wild Morning Glory Hillis 02-334 May-Oct; light purple w/ deep purple center, funnel-shaped; P
Convolvulaceae   Ipomoea purpurea   Hillis 02-359  
Cornaceae   Cornus drummondii Rough-leaf Dogwood Hillis 02-252 P tree; white flowers
Crassulaceae   Sedum nutallianum Yellow Stonecrop Hillis 222 Especially common in flats in NE corner
Cucurbitaceae   Cucurbita foetidissima Buffalo Gourd Hillis 02-  
Cucurbitaceae   Ibervillea lindheimeri Lindheimer's Globeberry Hillis 179  
Cupressaceae   Juniperus ashei Ashe Juniper field id Does not do well in Fly Gap's acidic soil; mostly stunted, favorite rubbing tree for deer and cattle
Cyperaceae   Carex muehlenbergii var. enervis Muhlenberg's Sedge Siedo 1039, Hillis 146, 159, 168, 184 wet areas along the creeks, ponds
Cyperaceae   Carex sp. 2   Hillis 152  
Cyperaceae   Cyperus acuminatus Tapertip Flatsedge Hillis 47A (1 plant--quite depauperate--found mixed in with Hillis #47 Tridens); P
Cyperaceae   Cyperus retroflexus One-flower Flatsedge Hillis 80 wet areas along the creeks, ponds
Cyperaceae   Cyperus sp. 4   Hillis 195  
Cyperaceae   Cyperus X-plankii "Hybrid" Flatsedge Hillis 37, 67 wet areas along the creeks, ponds. This is supposed to be a hybrid, or of hybrid origin, between C. croceus and C. retrorsus, one or both of which don't occur in the area. I don't know whether to believe it or not!
Cyperaceae   Eleocharis acutisquamata Sharpscale Spikerush Simpson 14-IV-01-20, Hillis 128 wet areas along the creeks, ponds
Cyperaceae   Eleocharis macrostachya Common Spikerush Hillis 128 Around margin of ponds
Cyperaceae   Eleocharis montevidensis Sand Spikerush Hillis 127, 134 Around margins of ponds and along creeks
Cyperaceae   Fimbristylis puberula Hairy Fimbry Hillis 174, 207 Grows along seasonal creeks on property
Cyperaceae   Fimbristylis vahlii Vahl's Fimbry Hillis 05-622 Grows aong seasonal creeks in tight bunches; A
Cyperaceae   Schoenoplectus pungens Bulrush, Common Threesquare Hillis 216, 02-277, 02-299 Grows along creek in moist sand; P
Ebenaceae   Diospyros texana Texas Persimmon Siedo 1042 Fruit matures August; important soft mast for deer; flowers Mar-Apr; white; P
Euphorbiaceae   Acalypha monococca Three-seeded Mercury Hillis 02-379, 05-595 Greenish flowers; cracks of rocky outcrops
Euphorbiaceae   Chamaesyce maculata Spotted Sandmat Hillis 3 Tiny white and pink flowers; low pubescent herb; A
Euphorbiaceae   Chamaesyce missurica Prairie Spurge Hillis 06-677, 06-678 Fall bloomer; tiny yellowish-white flowers; 3-part fruits; open sandy fields; A
Euphorbiaceae   Chamaesyce prostrata Prostrate Sandmat Hillis 02-386 Low, spreading plant in disturbed soil
Euphorbiaceae   Cnidoscolus texanus Bull Nettle (Mala Mujer) Hillis 02-298 In disturbed areas in fields; don't touch!; blooms Apr-Jul, white; P
Euphorbiaceae   Croton capitatus var. lindheimeri Hog Wort, Wolly Croton Hillis 25 Disturbed areas; seeds eaten by doves; foliage toxic; tallest species of Croton; A
Euphorbiaceae   Croton glandulosus var. glandulosus Vente Conmigo Hillis 69, 02-377, 06-666 Small white flowers
Euphorbiaceae   Croton lindheimerianus var. lindheimerianus Threeseed Croton Hillis 42, 06-679 Disturbed areas; seeds eaten by doves; foliage toxic; smaller species, sub-orbicular leaves; A
Euphorbiaceae   Croton monanthogynus Prairie Tea Hillis 06-666 Open fields; seeds eaten by doves; A
Euphorbiaceae   Croton texensis Texas Croton Hillis 43, 06-678 Disturbed areas; seeds eaten by doves; foliage toxic; smaller species, lanceolate leaves; A
Euphorbiaceae   Euphorbia marginata Snow-on-the-Mountain Hillis 02-372 White-edged leaves surrounding white flowers; A
Euphorbiaceae   Euphorbia spathulata Warty Spurge Hillis 03-489 Tiny yellow flowers; A/P
Euphorbiaceae   Phyllanthus polygenoides Smartweed leaf-flower Hillis 04-549, 04-556 Tiny white flowers; grows along creeks
Euphorbiaceae   Tragia sp. Noseburn Wendt  
Fabaceae   Acacia roemeriana Roemer's Acacia Hillis 07-683 White globular flowers in early April; P
Fabaceae   Astragalus austrinus var. austrinus Small-flowered Milkvetch Simpson 14-IV-01-8, Hillis 125 syn. A. nuttallianus var. austrinus; Mar-Apr; white to purplish; A
Fabaceae   Astragalus plattensis Platte River Milkvetch Hillis 145, 02-440 White to light lavender flowers; P
Fabaceae   Centrosema virginianum Spurred Butterfly Pea Hillis 02-362, 04-563 Large purple pea-like flowers; P
Fabaceae   Dalea emarginata Wedgeleaf prairie clover Hillis 02-287, 04-547 Purple flower
Fabaceae   Dalea nana Dwarf prairie clover Hillis 197, 211 Yellow flower
Fabaceae   Dalea multiflora Roundhead prairie clover Hillis 04-566 White flower
Fabaceae   Desmanthus acuminatus Wild Tantan Hillis 165, 03-473, 03-485 Western edge of range
Fabaceae   Desmanthus illinoensis Prairie Bundleflower Hillis 02-296 White, puff-ball flowers; P
Fabaceae   Desmodium paniculatum Panicled Tick-Trefoil Hillis 02-404 Lavender flowers; wetland indicator; P
Fabaceae   Desmodium sessilifolium Sessile-leaf Tick-Trefoil Hillis 02-329 Small yellow (white) flowers arranged on spike; P
Fabaceae   Galactia marginalis Edible Milkpea Hillis 06-669 Northwestern record; occurs in sandy habitats from south Texas through South America; purple flower; P
Fabaceae   Galactia volubilis Downy Milkpea Hillis 02-330, 02-392, 03-545 Lavender flowers; vine; P
Fabaceae   Indigofera miniata Scarlet Pea Hilis 02-380, 05-615 Salmon-pink flowers; spreading stems; P
Fabaceae   Lespedeza stuevei Tall Bush-Clover Hillis 17, 06-680 Lavender flowers; upright form;
Fabaceae   Lotus purshianus Deer Vetch Hillis 29, 02-251, 02-297, 02-376 small white and purple corolla; leaves alternate, once pinnate, 3-leaflets; A
Fabaceae   Lupinus texensis Texas Bluebonnet Hillis 117 Mar-Apr; blue; A
Fabaceae   Medicago lupulina Black Medic field id Introduced; Mar-Apr; yellow; A
Fabaceae   Medicago polymorpha Bur Clover Hillis 05-568, 05-571 Introduced; Mar-Apr, yellow; common along streams; A/P
Fabaceae   Mimosa aculeaticarpa biuncifera White Mimosa Hillis 02-236 White flowers, 4-8 pairs of pinnae with 5-12 pairs of leaflets per pinna; P
Fabaceae   Mimosa borealis Fragrant Mimosa Hillis 176, 02-248 Apr-May, to July with rain; pink-white flowers; 2-3 pairs of pinnae, 3-6 pairs of leaflets per pinna; P
Fabaceae   Mimosa nuttallii Nuttall's Sensitive Brier Hillis 166, 02-244, 03-487 Apr-June; round purple flowers; P
Fabaceae   Neptunia lutea Yellow Puff Hillis 04-558 Yellow flowers; open, sandy fields; P
Fabaceae   Pediomelum rhombifolium Gulf Indian Breadroot Hillis 03-443 Reddish-brown flowers; P
Fabaceae   Prosopis glandulosa Honey Mesquite Hillis 02-276 Yellow flowers in May-July, beans mature late summer (important deer food); P
Fabaceae   Psoralea rhombifolia Brown-flowered Psoralea Wendt P
Fabaceae   Rhynchosia senna Texas Snoutbean Hillis 06-665 Small yellow flowers; P
Fabaceae   Sophora affinis Eve's necklace Hillis 02-343, 02-244 (in fruit), 03-456 (in flower) Pink-white blooms with yellow highlights; rocky hillsides; deer relish; P
Fabaceae   Tephrosia lindheimeri Lindheimer's Tephrosia Hillis 167 Purple flowers; P
Fabaceae   Trifolium dubium Least hop clover Hillis 05-568  
Fabaceae   Trifolium repens White clover Hillis 04-550 White flowers; introduced; P
Fabaceae   Vicia ludoviciana var. ludoviciana Deer Pea Vetch Wendt 7161 Apr-May; lavender blue; A
Fabaceae   Zornia bracteata Viperina Hillis 164, 03-510 yellow flower with red/orange interior streaks
Fagaceae   Quercus buckleyi Texas Oak field id Least common oak on property; mostly in NE corner; P
Fagaceae   Quercus fusiformis Plateau Live Oak field id Prob. most important mast crop for deer; deer eat leaves as well, esp. in winter; P
Fagaceae   Quercus fusiformis X stellata Hybrid oak Wendt 7156 Get more material with mature leaves and acorns; one tree by NE splash pool; P
Fagaceae   Quercus marilandica Blackjack Oak Wendt 7159 Acorns small, more bitter than white oaks; P
Fagaceae   Quercus stellata Post Oak field id Second most important local mast crop for deer; P
Fumariaceae   Corydalis curvisiliqua var. curvisiliqua Scrambled eggs Hillis 98 A; yellow, tubular flowers
Gentianaceae   Eustoma russellianum Bluebell Gentian Hillis 02-309 A; large purple flower with dark center
Gentianaceae   Sabatia campestris Rose-Gentian Hillis 30, 02-278 pink-white corolla w/yellow center and stamens; Apr-Jul; A
Geraniaceae   Erodium cicutarium Alfilerillo, Stork's-bill Hillis 89, 109 Introduced weed
Geraniaceae   Geranium carolinianum Cranesbill Simpson 14-IV-01-19 W extreme of range; small flowered form; Mar-May; pale pink to white; A/B
Hydrocharitaceae   Najas guadalupensis Southern Naiad Hillis 07-688 grows in creeks, ponds
Hydrophyllaceae   Nama hispidum Sand Bells Hillis 28 Small purple flowers; blooms Mar-Jul; A
Hydrophyllaceae   Phacelia congesta Blue Curls (Fiddleneck) Hillis 143 Apr-May; blue-lavender; A
Hypericaceae   Hypericum   St. John's wort Hillis 05-600 Yellow flowers; A
Iridaceae   Sisyrinchium sp. Blue-eyed Grass Hillis 116 Apr-May; bluish to purple; P
Juglanaceae   Carya illinoinensis Pecan Hillis 02-368 Few trees on property; common along Fly Gap Road to north; P
Juglanaceae   Carya texana Black Hickory Hillis 05-625 Common along San Fernando Creek; P
Juncaceae   Juncus interior Inland Rush Siedo 1048, Hillis 192, 214 Fruits provide food for waterfowl
Juncaceae   Juncus marginatus Grassleaf Rush Hillis 36 Fruits provide food for waterfowl
Juncaceae   Juncus sp. 4   Hillis 126 Fruits provide food for waterfowl
Juncaceae   Juncus sp. 5   Hillis 213 Fruits provide food for waterfowl
Juncaceae   Juncus validus var. fascinatus Roundhead Rush Hillis 38 variety endemic to central Texas mineral region
Krameriaceae   Krameria lanceolata Trailing Ratany Hillis 164 Semiparasitic on other plants; P
Lamiaceae   Brazoria enquisti Llano Uplift Rattlesnake Flower Hillis 02-286 Recently described species, endemic to area; purple flower; grows in loose sandy soil, esp. near creeks; A
Lamiaceae   Lamium amplexicaule Henbit Hillis 88 introduced weed
Lamiaceae   Marrubium vulgare Horehound Hillis 02-289, 06-657 Introduced; grows under oaks frequented as resting area for cattle; P
Lamiaceae   Monarda clinopodioides Basil Beebalm Hillis 02-233 purple flowers
Lamiaceae   Monarda punctata Spotted Beebalm Hillis 02-285 white-yellow flowers on stalk; white bracts; May-Jun
Lamiaceae   Scutellaria drummondii var. edwardsiana Drummond's Skullcap Siedo 1035, Hillis 142, 06-663 Apr-May; bluish-purple; A/P
Lamiaceae   Scutellaria ovata Eggleaf Skullcap Hillis 06-659 Purple flowers, grows among rock boulders in sandy soil; P
Lamiaceae   Scutellaria wrightii Wright's Skullcap Hillis 06-663 Blue-purple flowers; P
Lamiaceae   Sideritis lanata Hairy Ironwort Hillis 06-643, 06-653, 06-656 Flowers white with white/purple edges; introduced from Asia Minor; A
Liliaceae   Allium canadense Wild onion Hillis 132, 217 Found along stream beds; P
Liliaceae   Allium drummondii Drummond's onion Hillis 163 Found along stream beds; Mar-May; white-pink; P
Liliaceae   Nothoscordum bivalve Crow-poison Hillis 61, 133 Also called False garlic; Mar-May, also in fall; white; P
Linaceae   Linum hudsonioides Texas Flax Panero #, Hillis 141 Mar-Sept; yellow; A
Loasaceae   Mentzelia oligosperma Stickleaf Hillis 02-306, 02-371, 06-649 P; yellow flower
Lythraceae   Rotala ramosior Tooth-cup Hillis 4 in mud along pond edge; leaves opposite, small cup-shaped flowers at base of stems; A
Malvaceae   Abutilon fruticosum Texas Indian Mallow Hillis 02-364, 06-652 Yellow flowers; partial shade; P
Malvaceae   Callirhoe involucrata var. lineariloba Wine Cup, Purple Poppymallow Hillis 2 Also called Poppy Mallow; Apr-Jun; red-violet; P
Malvaceae   Rhynchosida physocalyx Buffpetal Hillis 05-603 Yellow-orange flowers; P
Malvaceae   Sida abutifolia Spreading Fanpetals Hillis 02-366, 03-491, 03-512 Pale yellow flower; A/P
Malvaceae   Sida lindheimeri Showy Sida Hillis 64 NW-most edge of range
Malvaceae   Sida     Hillis 06-667 Yellow flowers; upright plant
Marsileaceae   Marsilea vestita Water-clover Hillis 04-562 Aquatic fern resembling four-leaf clover
Marsileaceae   Pilularia americana Pillwort field id Inconspicuous aquatic fern with filiform leaves
Menispermaceae   Cocculus carolinus Carolina Coralbead Hillis 05-591 Bright red berries; poisonous; P
Molluginaeae   Mollugo verticillata Indian Chickweed Hillis 59 Weedy annual
Moraceae   Morus rubra Red Mulberry Hillis 05-620 Small tree, grows in moist woods; P
Nyctaginaceae   Boerhavia coccinea Scarlet Spiderling Hillis 72 Weedy perennial, likely native to SW USA and Mexico; invasive elsewhere
Nyctaginaceae   Mirabilis jalapa Four O'Clock Hillis 05-590 Grows in deep soil in rocky outcrops; P
Nyctaginaceae   Mirabilis linearis Linear leaf four o'clock Hillis 02-247, 06-635, 07-721 white to lavender to yellowish-green delicate flowers; P
Onagraceae   Gaura brachycarpa Plains Beeblossom Hillis 124 Western edge of range; Mar-May; white to pink-red; A
Onagraceae   Gaura sp. 2 (white)   Hillis 148  
Onagraceae   Oenothera grandis Evening Primrose Panero #, Hillis 104 late Mar-Jun; yellow
Onagraceae   Oenothera laciniata Cut-leaved Evening Primrose Wendt 7160, Hillis 03-445 Apr-Oct; yellow; A
Oxalidaceae   Oxalis corniculata Creeping Wood-sorrel Hillis 96 P, yellow
Oxalidaceae   Oxalis stricta Common Yellow Wood-sorrel Hillis 135 P, yellow
Papaveraceae   Argemone albiflora Bluestem Prickly Poppy Hillis 129 Apr-July; white; P
Pedaliaceae   Proboscidea louisianica Devil's-claw field id  
Phytolaccaceae   Rivina humilis Pigeon-Berry Hillis 05-594, 05-611 Red buds, white to pink clusters of terminal flowers
Plantaginaceae   Plantago helleri Heller's Plantain ID'd fragment Mar-Jun; A
Plantaginaceae   Plantago virginica Pale-seeded Plantain Wendt 7158 W extreme of range; Mar-Jun; A
Plantaginaceae   Plantago wrightiana Wright's Plantain Hillis 12-766 Abundant in some years; A
Poaceae   Agrostis elliottiana Elliott's Bentgrass Wendt 7167 mostly awnless, awns short when present; western edge of range; A
Poaceae   Andropogon glomeratus Bushy Bluestem field id Grows near water; poor forage grass; P
Poaceae   Aristida purpurea Purple Three-awn Hillis 02-300 Poor forage grass; P
Poaceae   Aristida     Hillis 05-609  
Poaceae   Bothriochloa barbinodis var. perforata Pitted Beardgrass Hillis 32 Fair forage grass prior to maturity; indicator of range in good condition; P
Poaceae   Bothriochloa laguroides Silver Beardgrass field id Fair forage grass prior to maturity; increases under overgrazing; P
Poaceae   Bouteloua aristidoides Needle Grama field id Blooms summer-fall; A
Poaceae   Bouteloua curtipendula Sideoats Grama Hillis 39 Good forage summer-fall; P. 2 varieties occur in region--1 with rhizomes, 1 with "knotty" base
Poaceae   Bouteloua gracilis Blue Grama field id Good forage grass; starts growing in May, flowers Jul/Aug; P
Poaceae   Bouteloua hirsuta Hairy Grama Hillis 86 Fair forage grass; starts growing in May, flowers Jul/Aug; P
Poaceae   Bouteloua rigidiseta Texas Grama Hillis 02-243 P; poor forage grass
Poaceae   Bromus catharticus Rescue Grass Wendt 7165 Introduced from South America; good forage grass; cool season grass; A
Poaceae   Bromus japonicus Japanese Brome Hillis 06-662 Introduced from Asia; not a significant forage grass; cool season grass; A
Poaceae   Cenchrus spinifex (syn: incertus) Coast Sandbur Hillis 65 Irradication program in effect (pull on sight); pest species, indicator of disturbance; weak P
Poaceae   Chloris cucullata Hooded Windmill grass Hillis 34 Fair to good forage grass; provides fair forage in winter; P
Poaceae   Chloris subdolichostachya Shortspike Windmill grass Simpson 14-IV-01-21 Poor to fair forage grass; P
Poaceae   Cynodon dactylon Bermuda Grass field id Introduced from Eurasia; becoming less common; mostly in SE field and near entrance; P
Poaceae   Dichanthelium oligosanthes Heller's Rosette Grass Hillis 158 Grows mostly in shade of oak mottes, along creeks; fair forage grass; cool season grass; P
Poaceae   Digitaria californica Arizona Cottontop field id Good forage grass; P
Poaceae   Echinochloa crus-galli Barnyard Grass Hillis 11, 66 Fair forage early, otherwise poor forage grass, but good seed production for waterfowl; A
Poaceae   Elymus canadensis Canada Wild Rye Hillis 35 esp. on wooded slopes near streams; good forage grass; cool season grass; P
Poaceae   Eragrostis oxylepis Red Lovegrass Hillis 77, 87, 05-607 poor forage grass; P
Poaceae   Eragrostis pectinacea Tufted Lovegrass Hillis 31 Weedy pioneer species; A
Poaceae   Eragrostis trichodes Sand Lovegrass field id Good forage grass; P
Poaceae   Eragrostis     Hillis 07-709 Grows in rock crevices
Poaceae   Hordeum pusillum Little Barley Wendt 7166 Poor forage grass; A
Poaceae   Lolium perenne Ryegrass Hillis 218 Introduced; winter and early spring forage, but can inhibit some native grasses; cool season grass; A
Poaceae   Muhlenbergia lindheimeri Lindheimer's Muhly Hillis 44 endemic; fair forage grass; grows in moist areas; P
Poaceae   Muhlenbergia reverchonii Seep Muhly Hillis 71, 81 fair forage grass; grows in moist areas; P
Poaceae   Panicum hallii Hall's Switchgrass field id Fair forage grass; P
Poaceae   Panicum miliaceum Proso millet Hillis 33 Escaped; A
Poaceae   Panicum virgatum Switchgrass Hillis 45, 05-608 Good forage spring-early summer; P
Poaceae   Paspalum   Paspalum Hillis 06-646 Grows mostly in moist areas; P
Poaceae   Poa arachnifera Texas Bluegrass Wendt 7164 Indicator of undisturbed prairie; considered rare and local throughout range; cool season grass; P
Poaceae   Polypogon monspeliensis Rabbitfoot grass Hillis 27 Introduced; some forage value; A
Poaceae   Schizachyrium scoparium Little Bluestem field id Good forage when young; flowers summer-fall; seeds Oct-Nov; P
Poaceae   Setaria parviflora Knotroot Bristle grass Hillis 215 Fair forage grass; P
Poaceae   Setaria scheeli Southwestern Bristle grass Hillis 70, 05-602 Good forage grass; shaded canyons and open woodlands; P
Poaceae   Sorghastrum nutans Indiangrass Hillis 83 Good forage grass; P
Poaceae   Sorghum halepense Johnson Grass Hillis 02- Good foarge grass, but may become poisonous under drought or after first frost; introduced; P
Poaceae   Sporobolus cryptandrus Sand Dropseed Hillis 75, 78 Fair forage grass; P
Poaceae   Stipa leucotricha Texas Speargrass or Wintergrass Hillis 190 Fair to good grazing in early spring, awns problematic later; cool season grass; P
Poaceae   Tridens albescens White Tridens Hillis 47, 82 Fair forage grass; clay soil of swales; P
Poaceae   Tridens texana (or flavus) Texas Purpletop Hillis 79 Fair forage grass; open woods; P
Poaceae   Tripogon spicatus American Fiveminute Grass field id: Bill Carr Grows on shallow soil on granitic rocks; P
Poaceae   Vulpia octoflora Six-weeks Fescue Wendt 7152, Hillis 193 Short forage season in early spring; cool season grass; A
Polemoniaceae   Ipomopsis rubra Standing Cypress Hillis 02-303 Large red flower stalk; B
Polemoniaceae   Phlox drummondii var. mcallisteri Drummond's Phlox Hillis 97 May-Oct; red, violet, pink, white; P
Polygonaceae   Eriogonum annuum Annual Wild Buckwheat Hillis 06-675, 06-676 White or pink flowers; fall bloomer; common in sandy fields; A
Polygonaceae   Polygonum   White Smartweed Hillis 06-630 Grows around permanent water; white flowers; seeds favored by waterfowl; P
Polygonaceae   Polygonum pensylvanicum Pink Smartweed Hillis 05-621 Grows along creeks and in seasonally wet areas; pink flowers; seeds favored by waterfowl; A
Polygonaceae   Rumex hastatulus Heart Sorrel Wendt 7169, Hillis 02-241 W extreme of range, sandy; flowers greenish; P
Polygonaceae   Rumex pulcher Fiddle Dock Hillis 04-551 Green flowers; grows along seasonal creeks
Pontederiaceae   Heteranthera limosa Mud-Plantain Hillis 05-593 Grows in shallow water of temporary ponds; purple-blue flowers
Portulacaceae   Portulaca oleracea Common Purslane Hillis 05-604 Flowers yellow; A
Portulacaceae   Portulaca pilosa Shaggy Purslane, Kiss Me Quick Hillis 02-406, 05-612 Flowers purple; A
Portulacaceae   Portulaca umbraticola lanceolata Wing-pod Purslane Hillis 73, 05-605 Flowers red or copper-tipped; winged capsules; A
Portulacaceae   Talinum auranticum Orange Flame-flower Hillis 187 Orange flower open mid-afternoon; closes early and late
Portulacaceae   Talinum parviflorum Dwarf Flame-flower Hillis 07-717 Small succulent, grows in wet areas, small white flowers on stalks; P
Potamogetonaceae   Potamogeton diversifolius Diverse-leaf Pondweed Hillis 49 Grows in ponds; has two very different leaf types---one underwater, and the other floating
Primulaceae   Samolus parviflorus Water Pimpernel Hillis 02-282 Grows in wet places, near springs; tiny white flowers; P
Pteridaceae   Cheilanthes tomentosa Wolly Lipfern Wendt 7155, Hillis 94 Common on boulders and along ravines
Pteridaceae   Pellaea atropurpurea Purple Cliff-Brake Hillis 223 Grows on cliffs
Pteridaceae   Pellaea ovata Ovateleaf Cliff-Brake Hillis 212 Grows on cliffs
Pteridaceae   Pellaea wrightiana Wright's Cliff-Brake Hillis 200 Grows on rocks along ravines
Ranunculaceae   Anemone   Anemone Hillis 05-567 Grows along creek
Ranunculaceae   Delphinium carolinianum virescens Prairie Larkspur Hillis 02-234 White flowers
Ranunculaceae   Ranunculus pusillus Low Spearwort Hillis 05-581 Grows near water in rocky soil; tiny white flowers.
Rhamnaceae   Ziziphus obtusifolius Lotebush Hillis 02-367  
Rosaceae   Crataegus crus-galli Cockspur Hawthorn Wendt 7150 Trees alng several streams; blooms April; white fl; fruit Oct-Nov.; P
Rosaceae   Prunus mexicana Mexican Plum field id NE corner in oak mott; flowers mar-Apr; white; fruit Aug-Sep; P
Rosaceae   Prunus     Hillis 05-570  
Rosaceae   Pyrus ioensis var. texana Blanco Crabapple field id Planted
Rubiaceae   Cephalanthus occidentalis Buttonbush Hillis 14 Found along stream beds; Jun-Sep; white; fruit important bird food; P
Rubiaceae   Galium texense Texas Bedstraw Simpson 14-IV-01-14 W extreme of range; Mar-May; A
Rubiaceae   Hedyotis crassifolia Small Bluets Hillis 90  
Rubiaceae   Hedyotis humifusa Matted Bluets Simpson 14-IV-01-13 Mar-Sep; white to pink to lavender; A
Rutaceae   Ptelea trifoliata var. mollis Skunk-bush Hillis 1, 03-457 Few scattered individuals, especially along creeks, under oaks; fruits July-Aug; P
Rutaceae   Zanthoxylum hirsutum Texas Hercules' Club, Prickly-Ash Hillis 13 Scatterred, thorns highly variable; fruits mature in mid-summer, eaten by many birds; P
Salicaceae   Salix nigra Black Willow Hillis 02-295 Grows on tank bank
Sapindaceae   Sapindus saponaria var. drummondii Soap-berry Hillis 02-275 white flowers; Mr-Jul; P A few trees scattered about; oldest tree in SE field; also along creeks
Sapotaceae   Sideroxylon lanuginosum subsp. oblongifolium Wolly-Bucket Bumelia Hillis 16 Jun-Jul; purplish black fruit in fall; P (was Bumelia)
Scrophulariaceae   Bacopa rotundifolia Disk Waterhyssop Hillis 06-632 Grows around edges of temporary ponds in mud flats; small white flowers, succulent leaves, spreading
Scrophulariaceae   Castilleja indivisa Indian Paintbrush Simpson 14-IV-01-12, Hillis 05-598 late Mar-early May (occasionally to August); bracts red; A
Scrophulariaceae   Linaria texana Toadflax Wendt 7154, Hillis 106, 131, 03-451 Mar-May; light blue to violet; A/B
Scrophulariaceae   Lindernia dubia False Pimpernel Hillis 02-391, 03-498, 04-554 Jun-Aug; blue-violet corolla 7-10 mm; in mud of pond edge; A
Scrophulariaceae   Mimulus glabratus Monkey-flower Wendt 7163, Hillis 102, 114, 04-555 in muddy places; P
Scrophulariaceae   Veronica peregrina var. xalapensis Speedwell, Neckweed Wendt 7168, Hillis 03-469 Small white flowers; grows along shore of ponds
Selaginellaceae   Selaginella arenicola riddellii Riddell's Spikemoss Hillis 93 Western edge of range
Selaginellaceae   Selaginella peruviana Peruvian Spikemoss Hillis 201  
Smilaceceae   Smilax bona-nox Saw Green-brier Hillis 160, 161, 175 A deer staple; grows best when out of reach of deer; black berries also eaten; P
Solanaceae   Datura wrightii Sacred Thorn-Apple Hillis 03-542, 07-732 Long white flower that opens in evening; pollinated by hawk moths; pithy root; P
Solanaceae   Physalis mollis var. mollis Ground Cherry Simpson 14-IV-01-7 Apr-Jun; yellow; P
Solanaceae   Solanum dimidiatum Western Horsenettle Hillis 186  
Solanaceae   Solanum elaeagnifolium Silver-leaf Nightshade Hillis 24 Mar-Oct; violet to white, with yellow stamens; fruit yellow, turning black, poisonous; P
Solanaceae   Solanum rostratum Buffalo Bur Hillis 68  
Ulmaceae   Celtis reticulata Netleaf Hackberry Hillis 115 P
Ulmaceae   Ulmus americana American Elm Hillis 48 A few large trees along streams; in NE corner; P
Ulmaceae   Ulmus crassifolia Cedar Elm field id Adult trees along creeks; P
Urticaceae   Parietaria pensylvanica Pellitory Hillis 06-655, 07-708 Sticky plant; flowers in small axillary clusters, with prominent green bracts; A
Urticaceae   Urtica chamaedryoides Heartleaf Nettle Wendt 7170, Hillis 122, Panero # Mar-Jun; stinging hairs; A
Verbenaceae   Aloysia gratissima Whitebrush Hillis 185 Not abundant, doesn't form thickets as in other areas; P
Verbenaceae   Glandularia bipinnatifida Prairie Verbena field id Mar-Jul; purple; P
Verbenaceae   Glandularia pumila Pink Vervain Siedo 1037, Hillis 92 Feb-Jul; pink to lavender to blue; P
Verbenaceae   Lantana urticoides Texas Lantana Hillis 84  
Verbenaceae   Phyla nodiflora Frog-fruit Hillis 46 Trailing herb, semi-succulent leaves; stream bottoms; small flowers borne in bractlets; P
Verbenaceae   Verbena halei Texas Vervain Hillis 63; Hillis 07-687 Mar-Nov; bluish to lavender; P
Viscaceae   Phoradendron tomentosum Christmas Mistletoe Hillis 02-384 Grows mostly in mesquites, less abundant in oaks, mostly above deer reach (deer favorite); P
Vitaceae   Parthenocissus heptaphylla Sevenleaf Creeper Hillis 06-648 Grows on boulders and trees, especially along creeks. Endemic to Edwards Plateau.
Vitaceae   Vitus mustangensis Mustang Grape Hillis 02-361 Fruit ripe late June/early July; favorite soft mast of deer, which like the leaves, too; P
Woodsiaceae   Woodsia obtusa occidentalis Blunt-lobed Woodsia Wendt 7153 Can burn eyes and skin if handled or crushed. Common along ravines.
Zygophyllaceae   Tribulus terrestris Caltrop, Puncture Weed Hillis 76 Introduced noxious weed
 
 
 

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