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) |
|---|---|---|---|---|---|---|---|---|---|
| Quercus hinckleyi | Hinckley's oak | Plants | Yes | T 08/26/1988 |
T 12/30/1988 |
G2 | S2 | No | Creosote bush-mariola or lechuguilla-sotol shrublands on arid limestone slopes at mid-elevations in Chihuahuan Desert; flowering in spring, produces acorns late August-early September |
| Quercus robusta | robust oak | Plants | Yes | Not Listed | Not Listed | G1Q | S1 | Yes | Mixed evergreen-deciduous woodlands in moist canyon bottoms at elevations ca. 1,280 m (4,200 ft) in foothills of the Chisos Mountains; flowering in th spring |
| Quercus tardifolia | lateleaf oak | Plants | Yes | Not Listed | Not Listed | G1 | S1 | No | Mixed evergreen-deciduous woodlands in moist canyon bottoms at elevation ca. 2,150 m (7,050 ft) in the Chisos Mountains; flowering in the spring |
| Rayjacksonia aurea | Houston daisy | Plants | Yes | Not Listed | T 03/30/2020 |
G1 | S1 | Yes | 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) |
| Rhinotropis maravillasensis | Maravillas milkwort | Plants | Yes | Not Listed | Not Listed | G2 | S1 | No | Crevices of limestone exposed on canyons walls, along the Rio Grande and its tributaries, and in low desert mountains at 450-950 m (1,450-3,100 ft) elevation; appears restricted to the area of the Lower Canyons of the Rio Grande and lower Boquillas Canyon on both sides of the border; flowering May-October |
| Rhinotropis rimulicola var. rimulicola | rock crevice milkwort | Plants | Yes | Not Listed | Not Listed | G3T3 | S2 | No | <table width="1790"> <colgroup> <col width="1790"/> </colgroup> <tbody> <tr> <td width="1790"><span><span><span><span><span><span>Habitat description not available at this time.</span></span></span></span></span></span></td> </tr> </tbody></table> |
| Rhododon angulatus | Tharp's rhododon | Plants | Yes | Not Listed | Not Listed | G1Q | S1 | Yes | Deep, loose sands in sparsely vegetated areas on stabilized dunes of Pleistocene barrier islands; flowering (May-) June-September, sometimes later with appropriate rainfall |
| Rhododon ciliatus | Texas sandmint | Plants | Yes | Not Listed | Not Listed | G3 | S3 | Yes | Open sandy areas in the Post Oak Belt of east-central Texas; Annual; Flowering April-Aug; Fruiting May-Aug |
| Rhynchospora indianolensis | Indianola beakrush | Plants | Yes | Not Listed | Not Listed | G3Q | S3 | Yes | 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 |
| Rhynchospora macra | large beakrush | Plants | Yes | Not Listed | Not Listed | G3G4 | S2 | No | Found in ombotropic quaking peat bogs; Perennial; Flowering/Fruiting Aug-Oct |
| Rorippa ramosa | Durango yellow-cress | Plants | Yes | Not Listed | Not Listed | G2 | S1 | No | Moist, fine-textured, alluvial soils on floodplains and in beds of intermittent streams; flowering March-May |
| Rosa stellata ssp. mirifica var. erlansoniae | Erlanson's desert rose | Plants | Yes | Not Listed | Not Listed | G4T1 | S1 | No | Narrow endemic of the McKittrick Canyon in the Guadalupe Mountains; Perennial. |
| Rudbeckia scabrifolia | bog coneflower | Plants | Yes | Not Listed | Not Listed | G3G4 | S2 | No | 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 |
| Salvia pentstemonoides | big red sage | Plants | Yes | Not Listed | Not Listed | G1 | S1 | Yes | 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 |
| Salvia summa | great sage | Plants | Yes | Not Listed | Not Listed | G3 | S2 | No | Limestone cliffs and slopes in the Guadalupe and Franklin Mountains; Perennial; Flowering April-June; Fruiting May-Oct |
| Schizachyrium spadiceum | honey false bluestem | Plants | Yes | Not Listed | Not Listed | G3? | S1 | No | Dry limestong slopes in the desert mountains of Brewster County (Carr 2015). |
| Schoenolirion wrightii | Texas sunnybell | Plants | Yes | Not Listed | Not Listed | G3 | S3 | No | 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 |
| Schoenoplectus deltarum | Delta bulrush | Plants | Yes | Not Listed | Not Listed | G3G4 | S1 | No | Known in Texas only from freshwater wetlands near the Gulf� (Carr 2015). |
| Schoenoplectus hallii | Hall's baby bulrush | Plants | Yes | Not Listed | Not Listed | G3 | S1S2 | No | Recently discovered in and around ephemeral ponds on sandy to sandy loam or sandy clay soils; flowering/fruiting primarily summer and fall |
| Sclerocactus brevihamatus ssp. tobuschii | Tobusch fishhook cactus | Plants | Yes | T 06/14/2018 |
E 04/29/1983 |
G4T3 | S3 | Yes | 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) |
| Sclerocactus mariposensis | Lloyd's mariposa cactus | Plants | Yes | T 11/06/1979 |
T 04/29/1983 |
G3 | S3 | No | 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 |
| Scutellaria laevis | smooth-stem skullcap | Plants | Yes | Not Listed | Not Listed | G1 | S1 | Yes | On mountain slopes and in arroyos along dry streambeds of the Sierra Diablo, Beach Mountains, and Guadalupe Mountains; flowering April-September |
| Sedum havardii | Havard's stonecrop | Plants | Yes | Not Listed | Not Listed | G2 | S2 | No | 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 |
| Selaginella viridissima | green spikemoss | Plants | Yes | Not Listed | Not Listed | G2 | S1 | No | 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 |
| Selenia grandis | large selenia | Plants | Yes | Not Listed | Not Listed | G3 | S3 | Yes | Occurs in seasonally wet clayey soils in open areas; Annual; Flowering Jan-April; Fruiting Feb-April |