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 |