Species of Greatest Conservation Need
1124 species
| Scientifc Name | Common Name | Taxonomic Group | SGCN Status | Federal Status | State Status | Global Rank | State Rank | Endemic | General Habitat Type(s) |
|---|---|---|---|---|---|---|---|---|---|
| Styrax platanifolius ssp. stellatus | hairy sycamore-leaf snowbell | Plants | Yes | Not Listed | Not Listed | G3T3 | S3 | Yes | Rare throughout range, in habitats similar to those of var. platanifolius - usually in oak-juniper woodlands on steep rocky banks and ledges along intermittent or perennial streams, rarely far from some reliable source of moisture; Perennial; Flowering April-Oct; Fruiting May-Sept |
| Styrax platanifolius ssp. texanus | Texas snowbells | Plants | Yes | E 10/12/1984 |
E 01/09/1987 |
G3T1 | S1 | Yes | Limestone bluffs, boulder slopes, cliff faces, and gravelly streambeds, usually along perennial streams or intermittent drainages in canyon bottoms, in full sun or in partial shade of cliffs and/or Sycamore-Little walnut woodlands, oak-juniper woodlands, or mixed oak shrublands; flowering late March-April |
| Styrax platanifolius ssp. youngiae | Young's snowbell | Plants | Yes | Not Listed | Not Listed | G3T1 | S1 | No | 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 |
| Symphyotrichum puniceum var. scabricaule | rough-stem aster | Plants | Yes | Not Listed | Not Listed | G5T2 | S1S2 | No | 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. |
| Tauschia texana | Texas tauschia | Plants | Yes | Not Listed | Not Listed | G3 | S3 | Yes | Occurs in loamy soils in deciduous forests or woodlands on river and stream terraces; Perennial; Flowering/Fruiting Feb-April |
| Tetraneuris turneri | Billie's bitterweed | Plants | Yes | Not Listed | Not Listed | G3 | S3 | No | Grasslands on shallow sandy soils and caliche outcrops (Carr 2015). |
| Thalictrum arkansanum | Arkansas meadow-rue | Plants | Yes | Not Listed | Not Listed | G2Q | S2 | No | Mostly deciduous forests on alluvial terraces and upper drainages of hardwood slope forests at contacts with calcareous prairies; flowering March-April, withering by midsummer |
| Thalictrum texanum | Texas meadow-rue | Plants | Yes | Not Listed | Not Listed | G2Q | S2 | Yes | 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 |
| Thelesperma burridgeanum | Burridge greenthread | Plants | Yes | Not Listed | Not Listed | G3 | S3 | Yes | Sandy open areas; Annual; Flowering March-Nov; Fruiting March-June |
| Thelocactus bicolor var. flavidispinus | straw-spine glory-of-Texas | Plants | Yes | Not Listed | Not Listed | G4T2 | S2 | Yes | 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 |
| Thelypodiopsis shinnersii | Shinner's rocket | Plants | Yes | Not Listed | Not Listed | G2G3 | S2 | No | 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 |
| Thelypodium texanum | Texas thelypody | Plants | Yes | Not Listed | Not Listed | G3 | S3 | Yes | Locally frequent on gravelly slopes and in arroyo bottoms; Annual; Flowering/Fruiting Feb-April |
| Thurovia triflora | threeflower broomweed | Plants | Yes | Not Listed | Not Listed | G2G3 | S2S3 | Yes | 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 |
| Thymophylla tephroleuca | ashy dogweed | Plants | Yes | E 07/19/1984 |
E 01/09/1987 |
G2 | S2 | Yes | 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 |
| Tidestromia carnosa | fleshy tidestromia | Plants | Yes | Not Listed | Not Listed | G3 | S2 | No | Occurs in saline or gypseous soils in open situations; Annual; Flowering March-Nov; Fruiting April-Nov |
| Tillandsia baileyi | Bailey's ballmoss | Plants | Yes | Not Listed | Not Listed | G2G3 | S2 | No | 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 |
| Tradescantia buckleyi | Buckley's spiderwort | Plants | Yes | Not Listed | Not Listed | G3 | S3 | No | Occurs on sandy loam or clay soils in grasslands or shrublands underlain by the Beaumount Formation. |
| Tradescantia pedicellata | granite spiderwort | Plants | Yes | Not Listed | Not Listed | G2Q | S2 | Yes | 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 |
| Tragia nigricans | darkstem noseburn | Plants | Yes | Not Listed | Not Listed | G3 | S3 | Yes | Occurs in oak-juniper woodlands on mesic limestone slopes and canyon bottoms; Perennial; Flowering/Fruiting April-Oct |
| Trichocoronis wrightii var. wrightii | Wright's trichocoronis | Plants | Yes | Not Listed | Not Listed | G4T3 | S2 | No | 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 |
| Tridens buckleyanus | Buckley tridens | Plants | Yes | Not Listed | Not Listed | G3G4 | S3S4 | Yes | Occurs in juniper-oak woodlands on rocky limestone slopes; Perennial; Flowering/Fruiting April-Nov |
| Trillium texanum | Texas trillium | Plants | Yes | Not Listed | Not Listed | G3 | S3 | No | 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 |
| Triphora trianthophoros var. texensis | Texas three-birds orchid | Plants | Yes | Not Listed | Not Listed | G4?T1Q | S1 | Yes | 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 |
| Valeriana texana | Guadalupe valerian | Plants | Yes | Not Listed | Not Listed | G2 | S2 | No | 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 |
| Valerianella florifera | Texas cornsalad | Plants | Yes | Not Listed | Not Listed | G3 | S3 | Yes | Grasslands and early-successional openings in the post oak belt of east-central and northeast Texas; Sandy soils; Annual; Flowering March-April |