Species of Greatest Conservation Need

1279 species
Taxonomic Group
Federal Status
State Status
Endemic

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Species of Greatest Conservation Need (Updated: 01/31/2024)
Common Name Scientifc Name Taxonomic Group Federal Status State Status Global Rank State Rank Endemic General Habitat Type(s)
Young's snowbell Styrax platanifolius ssp. youngiae Plants Not Listed Not Listed G3T1 S1 False In Mexico occurs in relatively mesic montane limestone canyons; known in Texas from a single specimen ��in a canyon, Davis Mountains�; flowering Apr-May, fruiting July-September
rough-stem aster Symphyotrichum puniceum var. scabricaule Plants Not Listed Not Listed G5T2 S1S2 False Relatively open sites in saturated soils associated with seepage areas, bogs, marshes, ponds, drainages, and degraded wetland remnants on the Queen City, Carrizo, and Sparta sand formations; flowering late September-early November.
Texas tauschia Tauschia texana Plants Not Listed Not Listed G3 S3 True Occurs in loamy soils in deciduous forests or woodlands on river and stream terraces; Perennial; Flowering/Fruiting Feb-April
Billie's bitterweed Tetraneuris turneri Plants Not Listed Not Listed G3 S3 False Grasslands on shallow sandy soils and caliche outcrops (Carr 2015).
Arkansas meadow-rue Thalictrum arkansanum Plants Not Listed Not Listed G2Q S2 False Mostly deciduous forests on alluvial terraces and upper drainages of hardwood slope forests at contacts with calcareous prairies; flowering March-April, withering by midsummer
Texas meadow-rue Thalictrum texanum Plants Not Listed Not Listed G2Q S2 True Mostly found in woodlands and woodland margins on soils with a surface layer of sandy loam, but it also occurs on prairie pimple mounds; both on uplands and creek terraces, but perhaps most common on claypan savannas; soils are very moist during its active growing season; flowering/fruiting (January-)February-May, withering by midsummer, foliage reappears in late fall(November) and may persist through the winter
Burridge greenthread Thelesperma burridgeanum Plants Not Listed Not Listed G3 S3 True Sandy open areas; Annual; Flowering March-Nov; Fruiting March-June
straw-spine glory-of-Texas Thelocactus bicolor var. flavidispinus Plants Not Listed Not Listed G4T2 S2 True Rocky hills of the Caballos Novaculite formation; in desert grasslands or shrublands below about 1,500 m (5000 ft); flowering late March-May, also June-September after significant rainfall
Shinner's rocket Thelypodiopsis shinnersii Plants Not Listed Not Listed G2G3 S2 False Mostly along margins of Tamaulipan thornscrub on clay soils of the Rio Grande Delta, including lomas near the mouth of the river; Tamaulipas, Mexico specimens are from mountains, with no further detail; flowering mostly March-April, with one collection in December
Texas thelypody Thelypodium texanum Plants Not Listed Not Listed G3 S3 True Locally frequent on gravelly slopes and in arroyo bottoms; Annual; Flowering/Fruiting Feb-April
threeflower broomweed Thurovia triflora Plants Not Listed Not Listed G2G3 S2S3 True Near coast in sparse, low vegetation on a veneer of light colored silt or fine sand over saline clay along drier upper margins of ecotone between between salty prairies and tidal flats; further inland associated with vegetated slick spots on prairie mima mounds; flowering September-November
ashy dogweed Thymophylla tephroleuca Plants LE E G2 S2 True Grasslands with scattered shrubs; most sites on sands or sandy loams on level or very gently rolling topography over Eocene strata of the Laredo Formation; flowering March-May depending to some extent on rainfall
fleshy tidestromia Tidestromia carnosa Plants Not Listed Not Listed G3 S2 False Occurs in saline or gypseous soils in open situations; Annual; Flowering March-Nov; Fruiting April-Nov
Bailey's ballmoss Tillandsia baileyi Plants Not Listed Not Listed G2G3 S2 False Epiphytic on various trees and tall shrubs, perhaps most common in mottes of Live oak on vegtated dunes and flats in coastal portions of the South Texas Sand Sheet, but also on evergreen sub-tropical woodlands along resacas in the Lower Rio Grande Valley; flowering (February-)April-May, but conspicuous throughout the year
Buckley's spiderwort Tradescantia buckleyi Plants Not Listed Not Listed G3 S3 False Occurs on sandy loam or clay soils in grasslands or shrublands underlain by the Beaumount Formation.
granite spiderwort Tradescantia pedicellata Plants Not Listed Not Listed G2Q S2 True Mostly in fractures on outcrops of granite, gneiss, and similar igneous and metamorphic rocks, or in early successional grasslands or forb-dominated assemblages on well-drained, sandy to gravelly soils dervied from same; flowering at least April-May
darkstem noseburn Tragia nigricans Plants Not Listed Not Listed G3 S3 True Occurs in oak-juniper woodlands on mesic limestone slopes and canyon bottoms; Perennial; Flowering/Fruiting April-Oct
Wright's trichocoronis Trichocoronis wrightii var. wrightii Plants Not Listed Not Listed G4T3 S2 False Most records from Texas are historical, perhaps indicating a decline as a result of alteration of wetland habitats; Annual; Flowering Feb-Oct; Fruiting Feb-Sept
Buckley tridens Tridens buckleyanus Plants Not Listed Not Listed G3G4 S3S4 True Occurs in juniper-oak woodlands on rocky limestone slopes; Perennial; Flowering/Fruiting April-Nov
Texas trillium Trillium texanum Plants Not Listed Not Listed G3 S3 False In or along the margins of hardwood forests on wet acid soils of bottoms and lower slopes, strongly associated with forested seeps and baygalls; flowering March-May
Texas three-birds orchid Triphora trianthophoros var. texensis Plants Not Listed Not Listed G4?T1Q S1 True base of short, shallow, intermittent drainage slope with high organic matter (leaf-litter mulch) in dense, mixed hardwood (Southern red oak, hickory) pine (Shortleaf) forest stand; flowers from late July to early September
Guadalupe valerian Valeriana texana Plants Not Listed Not Listed G2 S2 False Pine-oak-juniper woodlands and moist crevices in limestone boulders and cliff faces in higher canyons of the Guadalupe Mountains; Perennial; Flowering April-Aug; Fruiting July
Texas cornsalad Valerianella florifera Plants Not Listed Not Listed G3 S3 True Grasslands and early-successional openings in the post oak belt of east-central and northeast Texas; Sandy soils; Annual; Flowering March-April
bigflower cornsalad Valerianella stenocarpa Plants Not Listed Not Listed G3 S3 True Usually along creekbeds or in vernally moist grassy open areas (Carr 2015).
Edwards Plateau cornsalad Valerianella texana Plants Not Listed Not Listed G2 S2 True Very shallow, well-drained, but seasonally moist gravelly-sandy soils derived from igneous or metamorphic rocks, often along the downslope margin of rock outcrops, in full sun or in partial shade of oak-juniper woodlands; more likely encountered in early successional areas; population numbers fluctuate considerably from year to year, with higher numbers following winters with higher rains and/or moderate temperatures; peak flowering/fruiting mid-March�late April, stems wither and disappear by the beginning of May