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)
Chisos coral-root Hexalectris revoluta var. revoluta Plants Not Listed Not Listed G2T1T2 S1 True In the Chisos and Guadalupe mountains, in humus in oak groves along rocky creekbeds at mid- to high elevations; in the Glass Mountains, it has been found 'among lechuguilla and shinnery oak on the sunny slopes and ridges'; purplish or brownish stem color provides a surprisingly effective camouflage from human observers, aerial stems are not reliably sent up every year; usually flowering May-August.
Warnock's coral-root Hexalectris warnockii Plants Not Listed Not Listed G2G3 S2 False In leaf litter and humus in oak-juniper woodlands on shaded slopes and intermittent, rocky creekbeds in canyons; in the Trans Pecos in oak-pinyon-juniper woodlands in higher mesic canyons (to 2000 m [6550 ft]), primarily on igneous substrates; in Terrell County under Quercus fusiformis mottes on terrraces of spring-fed perennial streams, draining an otherwise rather xeric limestone landscape; on the Callahan Divide (Taylor County), the White Rock Escarpment (Dallas County), and the Edwards Plateau in oak-juniper woodlands on limestone slopes; in Gillespie County on igneous substrates of the Llano Uplift; flowering June-September; individual plants do not usually bloom in successive years
Neches River rose-mallow Hibiscus dasycalyx Plants LT T G1 S1 True Open marshy habitats in seasonally wet alluvial soils, most often near standing rather than flowing water; flowering June-August
Drummond's rushpea Hoffmannseggia drummondii Plants Not Listed Not Listed G3 S3 False Open areas on sandy clay; Perennial
slender rush-pea Hoffmannseggia tenella Plants LE E G1 S1 True Coastal prairie grasslands on level uplands and on gentle slopes along drainages, usually in areas of shorter or sparse vegetation; soils often described as Blackland clay, but at some of these sites soils are coarser textured and lighter in color than the typical heavy clay of the coastal prairies; flowering April-November
Correll's bluet Houstonia correllii Plants Not Listed Not Listed G1 S1 True Sandy soils in grasslands with scattered shrubs or in mesquite savannas; does not occur in disturbed sandy areas or in improved pastures; flowering March, other months unknown
Croft's bluet Houstonia croftiae Plants Not Listed Not Listed G3 S3 True Occurs in sparsely vegetated areas in grasslands or among shrubs (Carr 2015).
Greenman's bluet Houstonia parviflora Plants Not Listed Not Listed G3 S3 True Grass pastures. Feb- Apr. (Correll and Johnston 1970).
biennial woolywhite Hymenopappus biennis Plants Not Listed Not Listed G3G4 S2 False Grasslands and open pine-juniper-oak woodlands on rocky, calcareous soils above 1,800 m (5,900 ft); flowering July-October
sandhill woolywhite Hymenopappus carrizoanus Plants Not Listed Not Listed G2 S2 True Disturbed or open areas in grasslands and post oak woodlands on deep sands derived from the Carrizo Sand and similar Eocene formations; flowering April-June
pygmy prairie dawn Hymenoxys perpygmaea Plants Not Listed Not Listed G1 S1 True Occurs in saline slick depressions on an alfisol prairie (Mink et al. 2012). The area is characterized by the presence of mima mounds (Mink et al. 2012). The prairie is classified as an alfisol Sporobolus silveanus (Swallen)�Carex meadii (Dewey) Herbaceous Prairie Association with mima mounds (NatureServe, 2010). The characteristic species of the slicks are ephemerals, short-lived annuals, or drought-tolerant specialists (Mink et al. 2012).
Texas prairie dawn Hymenoxys texana Plants LE E G2 S2 True In poorly drained, sparsely vegtated areas (slick spots) at the base of mima mounds in open grassland or almost barren areas on slightly saline soils that are sticky when wet and powdery when dry; flowering late February-early April
Vasey's bitterweed Hymenoxys vaseyi Plants Not Listed Not Listed G2 S1 False Occurs on xeric limestone cliffs and slopes at mid- to high elevations in desert shrublands.
Shumard's morning glory Ipomoea shumardiana Plants Not Listed Not Listed G2G3 S1 False Known only from two specimens, both collected in 1941 from one site along the Red River, gravelly roadside prairie; Perennial; Flowering June-Aug; Fruiting July
Havard's standing cypress Ipomopsis havardii Plants Not Listed Not Listed G3 S3 False Various open habitats at lower elevations in and near the mountains of Brewster, Hudspeth and Presidio counties; Perennial; Flowering Feb-Sept; Fruiting Feb-March
rock quillwort Isoetes lithophila Plants Not Listed T G1 S1 True Rooted in sand and gravel under shallow water of seasonal pools (vernal pools) that develop during rainy seasons in small, shallow, unshaded basins on barren outcrops of granite and gneiss; sporulating in late winter and spring, and opportunistically in other seasons following heavy rainfall
Piedmont quillwort Isoetes piedmontana Plants Not Listed Not Listed G4 S1 False Freshwater Wetland (vernal pools)
Runyon's water-willow Justicia runyonii Plants Not Listed Not Listed G2 S2 False Margins of and openings within subtropical woodlands or thorn shrublands on calcareous, alluvial, silty or clayey soils derived from Holocene silt and sand floodplain deposits of the Rio Grande Delta; can be common in narow openings such as those provided by trails through dense ebony woodlands and is sometimes restricted to microdepressions; flowering (July-) September-November
Warnock's water-willow Justicia warnockii Plants Not Listed Not Listed G3 S3 False Occurs mostly on xeric limestone uplands and rock outcrops; Perennial; Flowering May-Dec; Fruiting June
Wright's water-willow Justicia wrightii Plants Not Listed Not Listed G2 S1S2 True Shortgrass grasslands and/or shrublands; dry gravelly clay soils over limestone on flats and low hills at elevations of 900-1500 m (2950-4900 ft); flowering April-August, or perhaps after periods of sufficient rainfall
perennial caltrop Kallstroemia perennans Plants Not Listed Not Listed G1 S1 True Somewhat barren gypseous clays or limestone soils at low elevations in the Chihuahuan Desert; flowering late spring-early fall
tiny bog button Lachnocaulon digynum Plants Not Listed Not Listed G3G4 S1 False Wet, acid, exposed sands, sphagnum mats, and sandstone of hillside seepage bogs (hanging bogs); appears restricted to the Catahoula formation in Texas; usually among low growing graminoids; flowering and fruiting August-October
Turner's horseweed Laennecia turnerorum Plants Not Listed Not Listed G1 S1 True Occurs on silty limestone-derived soils in Chihuahuan Desert shrubland in basins sourrounded by desert mountains.
Texas golden gladecress Leavenworthia texana Plants LE E G1 S1 True Edaphically influenced herbaceous communities on shallow calcareous soils in vernally moist to wet glades on glauconite or ironstone outcrops of the Weches Formation; flowering or fruiting late February to April or May
Chisos pinweed Lechea mensalis Plants Not Listed Not Listed G1 S1 False Open oak-pinyon-juniper woodlands over igneous or sandstone rock outcrops at high elevations in the mountains of the Trans Pecos and adjacent New Mexico; in Mexico, gravelly soil over igneous rocks and on alternating limestone and rhyolite substrates; presumably flowering June-August