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 |