Species of Greatest Conservation Need

1279 species
Taxonomic Group
Federal Status
State Status
Endemic

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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)
spreading leastdaisy Chaetopappa effusa Plants Not Listed Not Listed G3G4 S4 True Limestone cliffs, ledges, bluffs, steep hillsides, sometimes in seepy areas, oak-juniper, oak, or mixed deciduous woods, 300-500 m elevation; Perennial; Flowering (May) July-Oct
mat leastdaisy Chaetopappa hersheyi Plants Not Listed Not Listed G3 S2 False Dry limestone cliffs (often steep or vertical), ledges, boulders, and other exposed Permian limestone surfaces at 1,500-2,400 m (4,900-7,900 ft) in higher mountain canyons of the Guadalupe Mountains; flowering May-August
awnless leastdaisy Chaetopappa imberbis Plants Not Listed Not Listed G3 S3 True In woodlands on lomas of Carrizo sand (TEX-LL specimens Carr 23875, 12507). Flowering and fruiting during Mar - May.
Parry's leastdaisy Chaetopappa parryi Plants Not Listed Not Listed G3 S1 False Rocky slopes, talus, crevices, chaparral, oak, oak-juniper, or oak-pine-fir woods, 1400-1600 m elevation; Perennial; Flowering May-Aug, Fruiting Aug; Flowering May-Sept (-Oct)
Texas windmill grass Chloris texensis Plants Not Listed Not Listed G2 S2 True Sandy to sandy loam soils in relatively bare areas in coastal prairie grassland remnants, often on roadsides where regular mowing may mimic natural prairie fire regimes; flowering in fall
Douglas rabbitbrush Chrysothamnus spathulatus Plants Not Listed Not Listed G3 S2 False Occurs in the Guadalupe Mountains of Tex. and adjacent N.M. at 0-6000 feet; Perennial; Fruiting Aug-Nov
cliff thistle Cirsium turneri Plants Not Listed Not Listed G3 S3 False Found mostly in fractures of vertical limestone cliff-faces in canyons along the Rio Grande; Perennial; Flowering April-Dec; Fruiting June-Oct
Carrizo Sands leather-flower Clematis carrizoensis Plants Not Listed Not Listed G2 S2 True Occurs in the margins of post oak woodlands on deep sands of Carrizo formation (Carr 2015).
scarlet leather-flower Clematis texensis Plants Not Listed Not Listed G3G4 S3S4 True Usually in oak-juniper woodlands in mesic rocky limestone canyons or along perennial streams; Perennial; Flowering March-July; Fruiting May-July
stalked rhombopod Cleomella longipes Plants Not Listed Not Listed G3G4 S3 False Locally common in sparingly vegetated sandy or alkaline soils and along margins of seasonal wetlands in the Trans-Pecos (Carr 2015).
Comal snakewood Colubrina stricta Plants Not Listed Not Listed G2 S1 False In El Paso County, found in a patch of thorny shrubs in colluvial deposits and sandy soils at the base of an igneous rock outcrop; the historic Comal County record does not describe the habitat; in Mexico ,found in shrublands on calcareous, gravelly, clay soils with woody associates; flowering late spring or early summer
Jones's rainlilly Cooperia jonesii Plants Not Listed Not Listed G3Q S3 True Hardpan swales and other seasonally moist low areas (Jones 1977). Flowering mid summer--early fall (Jul--Oct) (Flagg, Smith & Flory 2002).
Traub's rainlily Cooperia traubii Plants Not Listed Not Listed G3 S3 True Primarily sandy loam, open fields, coastal plains. Flowering early summer--mid fall (Jul--Nov) (Flagg, Smith & Flory 2002).
goldenwave tickseed Coreopsis intermedia Plants Not Listed Not Listed G3 S3 False In deep sandy soils of sandhills in openings in or along margins of post oak woodlands and pine-oak forests of east Texas; Perennial; Flowering/Fruiting May-Aug
Runyon's cory cactus Coryphantha macromeris var. runyonii Plants Not Listed Not Listed G5T2T3 S2S3 False Gravelly to sandy or clayey, calcareous, sometimes gypsiferous or saline soils, often over the Catahoula and Frio formations, on gentle hills and slopes to the flats between, at elevations ranging from 10 to 150 m (30 to 500 ft); ?late spring or early summer, November, fruit has been collected in August
Nickels' cory cactus Coryphantha nickelsiae Plants Not Listed Not Listed G2 SH False Limestone outcrops and nearby alluvial or gravelly soils on hills or plains in grasslands or shrublands at low elevations; known sites in Mexico have been described as Chihuahuan Desert scrub; flowering August through September
bunched cory cactus Coryphantha ramillosa ssp. ramillosa Plants LT T G2G3T2T3 S2S3 False Rocky slopes, ledges, and flats in the Chihuahuan Desert, most frequently on exposures of Santa Elena or Buda limestones or the Boquillas Formation between 400-1070 m (1300-3500 ft) in elevation; flowering August-November, perhaps as early as April in response to rainfall.
Scheer's cory cactus Coryphantha scheeri var. uncinata Plants Not Listed Not Listed G4TUQ S2 False Rocky hillsides (Carr 2015).
sawtooth hawthorn Crataegus mollis var. viburnifolia Plants Not Listed Not Listed G3 S3 True Rich alluvial soil, brushy habitats (Phipps 2015); Borders of woods and low ground (Correll and Johnston 1970); Flowering Mar; fruiting Sep�Oct.
Nixon's dwarf hawthorn Crataegus nananixonii Plants Not Listed Not Listed G1 S1 True Found in open upland post oak-bluejack oak, scrubby woodland, or shortleaf pine-oak woodland on the Carrizo Sands and other formations.
Turner's hawthorn Crataegus turnerorum Plants Not Listed Not Listed G3 S3 True Brush, dwarf oak scrub, stream banks, 300-600 m elevation; Perennial; Flowering April-June; Fruiting April-Sept
Sutherland hawthorn Crataegus viridis var. glabriuscula Plants Not Listed Not Listed G5T3T4 S3 False In mesic soils of woods or on edge of woods, treeline/fenceline, or thicket. Above\near creeks and draws, in river bottoms. Flowering Mar-Apr; fruiting May-Oct.
Texabama croton Croton alabamensis var. texensis Plants Not Listed Not Listed G3T2 S2 True In duff-covered loamy clay soils on rocky slopes in forested, mesic limestone canyons; locally abundant on deeper soils on small terraces in canyon bottoms, often forming large colonies and dominating the shrub layer; scattered individuals are occasionally on sunny margins of such forests; also found in contrasting habitat of deep, friable soils of limestone uplands, mostly in the shade of evergreen woodland mottes; flowering late February-March; fruit maturing and dehiscing by early June
Cory's croton Croton coryi Plants Not Listed Not Listed G3 S3 True Grasslands and woodland openings on barrier islands and coastal sands of South Texas, inland on South Texas Sand Sheet; Annual; Flowering July-Oct; Fruiting July-Nov
leatherweed croton Croton pottsii var. thermophilus Plants Not Listed Not Listed G5T1 S1 False Sparingly vegetated desert grasslands on extremely xeric sites at low elevations (500-800 m [1650-2640 ft), on substrates ranging from sand to limestone and basalt; flowering spring-fall