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)
Stanfield's beebalm Monarda stanfieldii Plants Not Listed Not Listed G3 S3 True Largely confined to granite sands along the middle course of the Colorado River and its tributaries; Perennial
Texas beebalm Monarda viridissima Plants Not Listed Not Listed G3 S3 True Endemic perennial herb of the Carrizo Sands; deep, well-drained sandy soils in openings of post oak woodlands; flowers white.
villous muhly Muhlenbergia villiflora var. villosa Plants Not Listed Not Listed G5T3 S2 False Alkaline (gypsum soil) desert flats; Perennial
Sayersville blue eyes Nemophila sayersensis Plants Not Listed Not Listed G2 S2 True Open fields and woodland margins on deep loose nutrient-poor sand (Simpson, Helfgott and Neff 2001). Mar-May.
broadsepal nissolia Nissolia platycalyx Plants Not Listed Not Listed G3 S1 False Located in the Chisos Mountains on ingeous soil; Perennial; Flowering May
sand sacahuiste Nolina arenicola Plants Not Listed Not Listed G2Q S2 True Mesquite-sand sage shrublands on windblown Quarternary reddish sand in dune areas; flowering time uncertain May-June, June-September
heartleaf evening-primrose Oenothera cordata Plants Not Listed Not Listed G3 S3 True Occurs in post oak woodlands on sandy soils on the coastal plain (Carr 2015).
Cory's evening-primrose Oenothera coryi Plants Not Listed Not Listed G3 S3 True Calcareous prairies in the Plains Country of north Texas and in the Panhandle; Perennial; Flowering April-May
Grand Prairie evening primrose Oenothera pilosella ssp. sessilis Plants Not Listed Not Listed G5T2 SH False Known in Texas from a single historic collection from Galveston Island; elsewhere known from remnant moist to dry tallgrass prairies on sandy or silty Alfisols over claypan on ancient river terraces of the Mississippi Alluvial Plain, and fragipan flatwoods; flowering May-June
Heller's marbleseed Onosmodium helleri Plants Not Listed Not Listed G3 S3 True Occurs in loamy calcareous soils in oak-juniper woodlands on rocky limestone slopes, often in more mesic portions of canyons; Perennial; Flowering March-May
sand prickly-pear Opuntia arenaria Plants Not Listed Not Listed G2 S2 False Deep, loose or semi-stabilized sands in sparsely vegetated dune or sandhill areas, or sandy floodplains in arroyos; flowering May-June
golden-spine prickly-pear Opuntia aureispina Plants Not Listed Not Listed G1 S1 False Desert flats and low hills on slabs of fractured Boquillas limestone, Chihuahuan Desert near Rio Grande, 480-850 m (1576-2800 ft) elevation; flowering March-May (-June)
silver cholla Opuntia imbricata var. argentea Plants Not Listed Not Listed G5T1 S1 True Rocky limestone slopes, rarely in alluvial soils in mesquite thickets, flowering April-July; fruit ripening two-three months after flowering
Livermore sweet-cicely Osmorhiza bipatriata Plants Not Listed T G5T1 S1 False Moist igneous-derived soils of shaded rocky slopes around springs in high mountain canyons; occurs in shade of a mesic canyon forest; flowering June-August
Big Bend hop-hornbeam Ostrya chisosensis Plants Not Listed Not Listed G2 S1 False Mixed woodlands on mesic, rocky, igneous slopes at high elevations in the Chisos Mountains; flowering May-June
Llano butterweed Packera texensis Plants Not Listed Not Listed G2 S2 True Endemic to Llano Uplift of Edwards Plateau; granite sands; arises quickly from evergreen winter rosettes during January rains; flowers Feb-Mar.
bushy whitlow-wort Paronychia congesta Plants Not Listed Not Listed G1 S1 True Sparingly vegetated openings in thorn shrublands on extremely shallow, highly limey, soils over caliche or calcareous rock of the Goliad Formation, on moderate slopes along its contact with the Catahoula and Frio formations; flowering mostly April-June, but as late as August, probably sporadically after rains throughout the season
Jones' nailwort Paronychia jonesii Plants Not Listed Not Listed G3G4 S3S4 True Occurs in early successional open areas on deep well-drained sand; Biennial Annual; Flowering March-Nov; Fruiting April-Nov
McCart's whitlow-wort Paronychia maccartii Plants Not Listed Not Listed GH SH True Known only from the type specimen, habitat poorly understood; substrate for type location described as very hard-packed red sand, possibly the Cuevita-Randado Complex, probably occurring in thorn shrubland plant community; based on type specimens presence of flowers and collection date, flowers in March, possibly also in other months and in response to rainfall
bristle nailwort Paronychia setacea Plants Not Listed Not Listed G3 S2 True Flowering vascular plant endemic to eastern southcentral Texas, occurring in sandy soils
Wilkinson's whitlow-wort Paronychia wilkinsonii Plants Not Listed Not Listed G2G3 S2 False Shallow rocky soils in crevices on novaculite hills or outcrops at low to moderate elevations in the Chihuahuan Desert; flowering April-October
turnip-root scurfpea Pediomelum cyphocalyx Plants Not Listed Not Listed G3G4 S2S3 True Grasslands and openings in juniper-oak woodlands on limestone substrates on the Edwards Plateau and in north-central Texas (Carr 2015).
Rydberg's scurfpea Pediomelum humile Plants Not Listed Not Listed G1 S1 False Shortgrass grasslands or cenizo-guajillo shrublands on shallow, stony to gravelly clay soils on dry, open limestone or yellowish, eroding caliche hills; flowering March-May, however, plants often do not appear above the ground surface if there is not sufficient precipitation, flowering and fruit maturation are also dependent on rainfall
Chihuahua scurfpea Pediomelum pentaphyllum Plants Not Listed Not Listed G1G2 SH False Texas habitat unknown; in Arizona, found in highly degraded desert grasslands or mixed desert scrub; soils are described as deep sandy loams, sometimes with sparse to moderate amounts of small-sized gravel (0.5-1 cm diameter), some soils display minor eolian coppicing; flowering April-May, again July-August depending on rainfall
Reverchon's scurfpea Pediomelum reverchonii Plants Not Listed Not Listed G3 S3 False Mostly in prairies on shallow rocky calcareous substrates and limestone outcrops; Perennial; Flowering Jun-Sept; Fruiting June-July