| Tharp's blue-star |
Amsonia tharpii |
Plants |
Not Listed |
Not Listed |
G1 |
S1 |
False |
Open areas in midgrass grasslands or shrublands in shallow clay soils over limestone; Bedrock at Pecos County site is mapped as Cretaeous limestone and marl of Washita Group; soils very shallow, well-drained calcareous moderately alkaline, light brownish-gray stony loam of Lozier-Rock outcrop, developed over fractured caliche-coated limestone; New Mexico site differs; Perennial; Flowering April-early May |
| Chihuahuan ringstem |
Anulocaulis leiosolenus var. lasianthus |
Plants |
Not Listed |
Not Listed |
G4T2 |
S2 |
False |
Xeric gypseous clay or limestone outcrops and flats; Perennial; Flowering/Fruiting Sept |
| Ojinaga ringstem |
Anulocaulis reflexus |
Plants |
Not Listed |
Not Listed |
G2 |
S1 |
False |
Primarily located on shaley gypseous clays at 800 - 1200 m (2600-4000 ft); Perennial; Flowering mid-May - mid-October |
| Guadalupe Mountains columbine |
Aquilegia chaplinei |
Plants |
Not Listed |
Not Listed |
G4T2 |
S2 |
False |
Perennially moist to wet limestone canyon walls; moist leaf litter and humus among boulders in wooded mesic canyons; Perennial; Flowering April-November (most reliably June-July) |
| Hinckley's columbine |
Aquilegia hinckleyana |
Plants |
Not Listed |
Not Listed |
G4T1 |
S1 |
True |
Wet areas near waterfalls, perennial seeps, springs, etc., in canyons of desert mountains; also widely-planted in residential settings, cultivars likely modified from original population from 30 years cultivation in horticultural trade; Perennial; Flowering March-November, heavily during March-April with trace flowering September-November |
| long-spurred columbine |
Aquilegia longissima |
Plants |
Not Listed |
Not Listed |
G3 |
S2 |
False |
Cooler, wetter areas near perennial seeps and springs in mesic mountain canyons; Perennial; Flowering/Fruiting June-Nov |
| Livermore sandwort |
Arenaria livermorensis |
Plants |
Not Listed |
Not Listed |
G1 |
S1 |
True |
Sparsely vegetated igneous rock outcrops at higher elevations, 2300-2500 m (7600-8200 ft) in the Davis Mountains; Perennial; Flowering August-October |
| Hill Country wild-mercury |
Argythamnia aphoroides |
Plants |
Not Listed |
Not Listed |
G2G3 |
S3 |
True |
Mostly in bluestem-grama grasslands associated with plateau live oak woodlands on shallow to moderately deep clays and clay loams over limestone on rolling uplands, also in partial shade of oak-juniper woodlands in gravelly soils on rocky limestone slopes; Perennial; Flowering April-May with fruit persisting until midsummer |
| silvery wild-mercury |
Argythamnia argyraea |
Plants |
Not Listed |
Not Listed |
G2 |
S2 |
True |
Among shortgrasses in grasslands or open shrublands on which whitish clay soils, particularly those derived from the Yegua Formation; Perennial; Flowering April-June; fruit may persist until fall |
| prostrate milkweed |
Asclepias prostrata |
Plants |
Not Listed |
Not Listed |
G1G2 |
S1 |
False |
Grasslands or openings in shrublands on loamy fine sands and fine sandy loams of the Copita, Hebbronville, and possibly other soil series occurring over the Laredo, Yegua, and other Eocene formations; also in Loreto caliche sand plain in Tamaulipas; flowering April-October, but may be sporadic and dependent on rainfall |
| gyp locoweed |
Astragalus gypsodes |
Plants |
Not Listed |
Not Listed |
G3 |
S2 |
False |
Gypsum or stiff gypseous clay soils on low rolling hills, mostly low elevations in the middle Pecos River valley; many of the known locations are on the Castile Formation (Permian); flowering March-June |
| Cory's woolly locoweed |
Astragalus mollissimus var. coryi |
Plants |
Not Listed |
Not Listed |
G5T3 |
S3 |
True |
Grasslands over limestone on the western Edwards Plateau; Perennial; Flowering March-May |
| withered woolly loco |
Astragalus mollissimus var. marcidus |
Plants |
Not Listed |
Not Listed |
G5T2 |
S2 |
True |
Short to midgrass grasslands and occasionally shrublands on gravelly and sometimes clayey soils in basins, flats, and slopes at mid to higher elevations among the mountains of the Trans-Pecos, usually on conglomerate or igneous substates; flowering April-July |
| Texas milk vetch |
Astragalus reflexus |
Plants |
Not Listed |
Not Listed |
G3 |
S3 |
True |
Grasslands, prairies, and roadsides on calcareous and clay substrates; Annual; Flowering Feb-June; Fruiting April-June |
| Soxman's milkvetch |
Astragalus soxmaniorum |
Plants |
Not Listed |
Not Listed |
G3 |
S3 |
False |
Primarily in deep sandy soils of sandhills, fallow fields, and open scrub oak-pine woodlands; Perennial; Flowering March-June; Fruiting April-June |
| Waterfall's milkvetch |
Astragalus waterfallii |
Plants |
Not Listed |
Not Listed |
G3? |
S3 |
False |
Rocky limestone slopes; Perennial; Flowering Feb-May; Fruiting April- May |
| Wright's milkvetch |
Astragalus wrightii |
Plants |
Not Listed |
Not Listed |
G3 |
S3 |
True |
On sandy or gravelly soils; Flowering/fruiting: April and May |
| star cactus |
Astrophytum asterias |
Plants |
LE |
E |
G1G2 |
S1 |
False |
Gravelly clays or loams, possibly of the Catarina Series (deep, droughty, saline clays), over the Catahoula and Frio formations, on gentle slopes and flats in sparsely vegetated openings between shrub thickets within mesquite grasslands or mesquite-blackbrush thorn shrublands; plants sink into or below ground during dry periods; flowering from mid March-May, may also flower in warmer months after sufficient rainfall, flowers most reliably in early April; fruiting mid April-June |
| Kleberg saltbush |
Atriplex klebergorum |
Plants |
Not Listed |
Not Listed |
G2 |
S2 |
True |
Usually occurs in sparsely vegetated saline areas, including flats and draws; in light sandy or clayey loam soils with other halophytes; occasionally observed on scraped oil pad sites; observed flowering in late August-early September, but may vary with rainfall, fruits are usually present in fall; because of its annual nature, populations fluctuate widely from year to year |
| Texas ayenia |
Ayenia limitaris |
Plants |
LE |
E |
G2 |
S1 |
False |
Subtropical thorn woodland or tall shrubland on loamy soils of the Rio Grande Delta; known site soils include well-drained, calcareous, sandy clay loam (Hidalgo Series) and neutral to moderately alkaline, fine sandy loam (Willacy Series); also under or among taller shrubs in thorn woodland/thorn shrubland; flowering throughout the year with sufficient rainfall |
| Texas screwstem |
Bartonia paniculata ssp. texana |
Plants |
Not Listed |
Not Listed |
G2G3 |
S2S3 |
False |
In and around acid seeps in Pine-Oak forests on gentle slopes and baygall shrub thickets at spring heads; often on clumps of bryophytes at tree bases, on roots, and on logs; flowering September-November, can be identified in mid to late October when its in fruit |
| purple gay-mallow |
Batesimalva violacea |
Plants |
Not Listed |
Not Listed |
G1 |
S1 |
False |
Among boulders in seasonally moist igneous rock canyons, often under small trees and large shrubs; habitat in Mexico dry deciduous forest and matorral; flowering/fruiting at least October-November in Big Bend National Park, possibly throughout the year in Mexico |
| Anacacho orchid tree |
Bauhinia lunarioides |
Plants |
Not Listed |
Not Listed |
G3 |
S1 |
False |
Shrublands in draws on rocky limestone slopes and on limestone ledges along rivers; Perennial; Flowering March-Dec; Fruiting May-Oct |
| Texas barberry |
Berberis swaseyi |
Plants |
Not Listed |
Not Listed |
G3 |
S3 |
True |
Shallow calcareous stony clay of upland grasslands/shrublands over limestone as well as in loamier soils in openly wooded canyons and on creek terraces; Perennial; Flowering/Fruiting March-June |
| Bigelow's desert grass |
Blepharidachne bigelovii |
Plants |
Not Listed |
Not Listed |
G3 |
S3 |
False |
Restricted to xeric limestone or various gypsum-influenced habitats; Perennial; Flowering March-Dec; Fruiting March-Dec |