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)
Texas seymeria Seymeria texana Plants Not Listed Not Listed G3 S3 True Found primarily in grassy openings in juniper-oak woodlands on dry rocky slopes but sometimes on rock outcrops in shaded canyons; Annual; Flowering May-Nov; Fruiting July-Nov
springrun whitehead Shinnersia rivularis Plants Not Listed Not Listed G2G3 S1 False In shallow, slow-moving water in small, usually spring-fed streams and rivers arising from calcareous outcrops; abandoned river channel fed by a strong perennial stream, rooted in fine-textured sediments, with stems entirely submerged and only the flowering branch tips appearing above water surface; in slowly flowing water up to 0.3-0.4 m deep but appeared to be absent from deeper water, shaded for most of the day; also in water 0.5-1 m deep, rooted in a mucky to gravelly bottom; flowering throughout the year, most reliably March-May
gray sibara Sibara grisea Plants Not Listed Not Listed G3 S1 False Limestone cliff faces, talus slopes and oak-juniper woodlands in mesic canyons of the Guadalupe Mountains; Annual; Flowering/Fruiting July
smooth bur-cucumber Sicyos glaber Plants Not Listed Not Listed G3 S1 False Mesic canyons in the Chisos and Guadalupe Mountains (Carr 2015).
Plank's catchfly Silene plankii Plants Not Listed Not Listed G2 S1 False Franklin Mountains of El Paso County, occurring in crevices on shaded igneous cliff faces above ca. 5000 ft.; Perennial; Flowering summer-early autumn
scarlet catchfly Silene subciliata Plants Not Listed Not Listed G3 S3 False Deep well-drained sandy soils in and along margins of fire-maintained, dry, upland, longleaf pine savannas; in fire-suppressed forests with dense understory, it is often limited to sunnier roadsides or cleared utility easements; also sparingly in moister sands on openly forested creek banks; flowering early July-October, sometimes early November
Davis Mountains horse-nettle Solanum davisense Plants Not Listed Not Listed G3 S2 False Mostly in medium to high elevations in the Chisos, Davis and Chinati mountains of Brewster, Jeff Davis and Presidio counties, but also at lower-elevation sites; sometimes weedy where it occurs; Annual; Flowering/Fruiting June-Oct
Rolling Plains goldenrod Solidago mollis var. angustata Plants Not Listed Not Listed G5T3 S2 False Occurs on gypsum outcrops and other xeric habitats; Perennial
Texas pinkroot Spigelia texana Plants Not Listed Not Listed G3 S3 True Woodlands on loamy soils; Perennial; Flowering March-Nov; Fruiting April-Nov
Texas ladies'-tresses Spiranthes brevilabris Plants Not Listed Not Listed G1G2 S1 False Sandy soils in moist prairies, incl. blackland/Fleming prairies, calcareous prairie pockets surrounded by pines, pine-hardwood forest, open pinelands, wetland pine savannahs/flatwoods, and dry to moist fields, meadows, and roadsides. Delicate, nearly ephemeral orchid, producing winter rosettes, flowers Feb-Apr. Historically endemic to SE coastal plain.
giant spiral ladies'-tresses Spiranthes longilabris Plants Not Listed Not Listed G3 S1 False Restricted to wetland pine savannas; Low woods, wet open areas; Perennial; Flowering Oct-Dec; Fruiting Nov
Navasota ladies'-tresses Spiranthes parksii Plants LE E G3 S3 True Openings in post oak woodlands in sandy loams along upland drainages or intermittent streams, often in areas with suitable hydrologic factors, such as a perched water table associated with the underlying claypan; flowering populations fluctuate widely from year to year, an individual plant does not flower every year; flowering late October-early November (-early December)
Tharp's dropseed Sporobolus tharpii Plants Not Listed Not Listed G3 S3 True Occurs on barrier islands, shores of lagoons and bays protected by the barrier islands, and on shores of a few near-coastal ponds. Plants occur at the bases of dunes, in interdune swales and sandflats, and on upper beaches. The substrate is of Holocene age.
Texas golden prince's-plume Stanleya pinnata var. texana Plants Not Listed Not Listed G5T1 S1 True Occurs on clay or silty soils on sparsely vegetated limestone and/or gypseous hills, draws, washes, and flats.
Mary's bluet Stenaria butterwickiae Plants Not Listed Not Listed G1 S1 True Shallow pockets or crevices in limestone bedrock on ridgetops; flowering or fruiting at least May-August
Jackie's bluet Stenaria mullerae var. pooleana Plants Not Listed Not Listed G1Q S1 True North- to east-facing vertical limestone cliff faces in mid-elevation canyons in mountains in the Chihuahuan Desert; flowering May, perhaps to September
bracted twistflower Streptanthus bracteatus Plants PT Not Listed G1 S1 True Shallow, well-drained gravelly clays and clay loams over limestone in oak juniper woodlands and associated openings, on steep to moderate slopes and in canyon bottoms; several known soils include Tarrant, Brackett, or Speck over Edwards, Glen Rose, and Walnut geologic formations; populations fluctuate widely from year to year, depending on winter rainfall; flowering mid April-late May, fruit matures and foliage withers by early summer
lyreleaf twistflower Streptanthus carinatus ssp. carinatus Plants Not Listed Not Listed G4T3T4 S3 False Occurs on igneous and limestone slopes and alluvial fans (Carr 2015).
Cutler's twistflower Streptanthus cutleri Plants Not Listed Not Listed G2 S2 False Open shrublands or grasslands on calcareous gravel of talus slopes, rocky hillsides, and gravelly streambeds, at moderate elevations in the Chihuahuan Desert; flowering mostly February-March, sometimes into May
clasping twistflower Streptanthus maculatus ssp. maculatus Plants Not Listed Not Listed G3T2T3Q S2 False Primarily on seasonally moist barrens on the Weches Formation but has been found elsewhere as well (Carr 2015)
broadpod twistflower Streptanthus platycarpus Plants Not Listed Not Listed G3 S3 False Western Edwards Plateau and the Trans-Pecos, seemingly disjunct in Llano Uplift area, occurring sparingly in various habitats; Biennial Annual; Flowering/Fruiting March-June
sparsely-flowered jewelflower Streptanthus sparsiflorus Plants Not Listed Not Listed G2Q S1 False Shaded areas in gravelly limestone canyons and arroyos, often in dry creek beds at elevations ranging 1,200-1,800 m (3,900-5,900 ft); flowering May-June; populations vary widely in size from year to year depending on rainfall
sycamore-leaf snowbell Styrax platanifolius ssp. platanifolius Plants Not Listed Not Listed G3T3 S3 True Rare throughout range, 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-May; Fruiting May-Aug.
hairy sycamore-leaf snowbell Styrax platanifolius ssp. stellatus Plants Not Listed Not Listed G3T3 S3 True 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
Texas snowbells Styrax platanifolius ssp. texanus Plants LE E G3T1 S1 True 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