Species of Greatest Conservation Need

1279 species
Taxonomic Group
Federal Status
State Status
Endemic

Export results as CSV

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)
Houston daisy Rayjacksonia aurea Plants Not Listed T G1 S1 True On and around naturally barren or sparsely vegetated saline slick spots or pimple mounds on coastal prairies, usually on sandy to sandy loam soils, occasionally in pastures and on roadsides in similar soil types where mowing may mimic natural prairie disturbance regimes; flowering late September-November (-December)
Tharp's rhododon Rhododon angulatus Plants Not Listed Not Listed G1Q S1 True Deep, loose sands in sparsely vegetated areas on stabilized dunes of Pleistocene barrier islands; flowering (May-) June-September, sometimes later with appropriate rainfall
Texas sandmint Rhododon ciliatus Plants Not Listed Not Listed G3 S3 True Open sandy areas in the Post Oak Belt of east-central Texas; Annual; Flowering April-Aug; Fruiting May-Aug
Indianola beakrush Rhynchospora indianolensis Plants Not Listed Not Listed G3Q S3 True Locally abundant in cattle pastures in some areas (at least during wet years), possibly becoming a management problem in such sites; Perennial; Flowering/Fruiting April-Nov
large beakrush Rhynchospora macra Plants Not Listed Not Listed G3G4 S2 False Found in ombotropic quaking peat bogs; Perennial; Flowering/Fruiting Aug-Oct
Durango yellow-cress Rorippa ramosa Plants Not Listed Not Listed G2 S1 False Moist, fine-textured, alluvial soils on floodplains and in beds of intermittent streams; flowering March-May
Erlanson's desert rose Rosa stellata ssp. mirifica var. erlansoniae Plants Not Listed Not Listed G4T1 S1 False Narrow endemic of the McKittrick Canyon in the Guadalupe Mountains; Perennial.
bog coneflower Rudbeckia scabrifolia Plants Not Listed Not Listed G3G4 S2 False Restricted to partial shade at the lower edges of hillside seepage bogs and associated broadleaf semi-evergreen acid seep forests; typically at the head of a spring or seep, and usually on sites underlain by the Catahoula Formation or near the Catahoula-Fleming contact; flowering June-September
big red sage Salvia pentstemonoides Plants Not Listed Not Listed G1 S1 True Moist to seasonally wet, steep limestone outcrops on seeps within canyons or along creek banks; occasionally on clayey to silty soils of creek banks and terraces, in partial shade to full sun; basal leaves conspicuous for much of the year; flowering June-October
great sage Salvia summa Plants Not Listed Not Listed G3 S2 False Limestone cliffs and slopes in the Guadalupe and Franklin Mountains; Perennial; Flowering April-June; Fruiting May-Oct
honey false bluestem Schizachyrium spadiceum Plants Not Listed Not Listed G3? S1 False Dry limestong slopes in the desert mountains of Brewster County (Carr 2015).
Texas sunnybell Schoenolirion wrightii Plants Not Listed Not Listed G3 S3 False Rocky barrens in the Post Oak region near College Station, with a few disjunct populations on the Catahoula Formation of southeast Texas; Perennial; Flowering March-April; Fruiting March
Delta bulrush Schoenoplectus deltarum Plants Not Listed Not Listed G3G4 S1 False Known in Texas only from freshwater wetlands near the Gulf� (Carr 2015).
Hall's baby bulrush Schoenoplectus hallii Plants Not Listed Not Listed G3 S1S2 False Recently discovered in and around ephemeral ponds on sandy to sandy loam or sandy clay soils; flowering/fruiting primarily summer and fall
Tobusch fishhook cactus Sclerocactus brevihamatus ssp. tobuschii Plants LT E G4T3 S3 True Shallow, moderately alkaline, stony clay and clay loams over massive fractured limestone; usually on level to slightly sloping hilltops; occasionally on relatively level areas on steeper slopes, and in rocky floodplains; usually open areas within a mosaic of oak-juniper woodlands, occasionally in pine-oak woodlands, rarely in cenizo shrublands or little bluestem grasslands; sites are usually open with only herbaceous cover, although the cactus may be somewhat protected by rocks, grasses, or spikemosses; flowering (late January-) February-March (rarely early April)
Lloyd's mariposa cactus Sclerocactus mariposensis Plants LT T G3 S2 False Among low shrubs and rosette-forming perennials in gravelly or rocky soils on arid limestone slopes in the Chihuahuan Desert, mostly on Boquillas Formation; elevation 750-1,050 m (2,450-3,450 ft); flowering February-mid March, fruit maturing 1-2 months later
smooth-stem skullcap Scutellaria laevis Plants Not Listed Not Listed G1 S1 True On mountain slopes and in arroyos along dry streambeds of the Sierra Diablo, Beach Mountains, and Guadalupe Mountains; flowering April-September
Havard's stonecrop Sedum havardii Plants Not Listed Not Listed G2 S2 False Crevices in igneous rock outcrops, sometimes loose igneous talus, in oak-pinyon woodlands and chaparral at mid- to high elevations in the Chisos (rocky west facing slope) and Davis mountains; flowering May-September
green spikemoss Selaginella viridissima Plants Not Listed Not Listed G2 S1 False Shaded or sheltered igneous, limestone, or sandstone rock ledges, boulders, and cliffs in woodlands and shrublands; can occur in areas susceptible to flash flooding, as well as, prolonged hot, dry conditions; sporiferous June-August
large selenia Selenia grandis Plants Not Listed Not Listed G3 S3 True Occurs in seasonally wet clayey soils in open areas; Annual; Flowering Jan-April; Fruiting Feb-April
Jones' selenia Selenia jonesii Plants Not Listed Not Listed G3 S3 True Wet clayey soils of stream margins, playa lakes, and roadsides, mostly in the western Edwards Plateau; Annual; Flowering Feb-April; Fruiting March-April
Quayle's butterweed Senecio quaylei Plants Not Listed Not Listed G1Q S1 True Known only from the type location in Parker County, where it occured in a weedy roadside ditch; Annual; Flowering spring
Orcutt's senna Senna orcuttii Plants Not Listed Not Listed G2 S2 False Gravelly or rocky soil on limestone slopes and in beds of intermittent streams, within various mid- to lower elevation Chihuahuan Desert communities; at least one site is on east- to north-facing slopes; flowering July-August
Ripley's senna Senna ripleyana Plants Not Listed Not Listed G1 SH False Gravelly hilltops in arid grasslands and creosote flats in Chihuahuan Desert; elevation ranges 1,200-1,500 m (3,900-4,900 ft); flowering/fruiting July-October
roughseed sea-purslane Sesuvium trianthemoides Plants Not Listed Not Listed GH SH True Dunes and perhaps in saline clay of tidal flats or ephemeral ponds within a dune landscape; likely flowering June-August