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)
Parks' jointweed Polygonella parksii Plants Not Listed Not Listed G2 S2 True Mostly found on deep, loose, whitish sand blowouts (unstable, deep, xeric, sandhill barrens) in Post Oak Savanna landscapes over the Carrizo and Sparta formations; also occurs in early successional grasslands, along right-of-ways, and on mechanically disturbed areas; flowering June-late October or September-November
stinking rushpea Pomaria austrotexana Plants Not Listed Not Listed G3 S3 False In open areas on deep well drained sands; Perennial; Flowering Feb-Oct; Fruiting April-Oct
broadpod rushpea Pomaria brachycarpa Plants Not Listed Not Listed G2 S2 True Grasslands, live oak savannas, and open mesquite woodlands on shallow, stony, clay soils over limestone; most specimens are from ungrazed roadsides, often in shallowest soils on landscape where competition from taller perennial grasses is minimal; flowering April-July, possibly also in November
Little Aguja pondweed Potamogeton clystocarpus Plants LE E G1 S1 True Submersed in still or slowly flowing water of pools in intermittent creeks and rooted in sand and gravel derived from igneous rock of surrounding mountain slopes; fruiting May-October, and possibly later
barbed rattlesnake-root Prenanthes barbata Plants Not Listed Not Listed G3 S3 False In east Texas occurs on calciphilc hardwood terraces above floodplains, and seepage slopes, often in the company of a comparatively rich herbaceous flora; elsewhere found on prairies, barrens, and open woodlands; in calcareous substrates and in sand over clay on the Weches, Fleming, and Lissie formations; flowering August-November
canyon rattlesnake-root Prenanthes carrii Plants Not Listed Not Listed G2 S2 True Rich humus soils over limestone in upper woodland canyon drainages, upper small spring fed drainages, typically near springs in deep soils around the springs and on limestone shelves, honeycomb rock (porous rock); flowering and fruiting late August-November
dune unicorn-plant Proboscidea sabulosa Plants Not Listed Not Listed G3 S2 False Deep, dry to seasonally moist loose sands on sparsely vegetated, unstabilized dunes and in openings in shinneries; in New Mexico, one location found as a secondary successional species in fallow fields; does not germinate in years with inadequate summer rainfall, but may be locally abundant during unusually wet summers; flowering July-August, with fruits maturing in fall
many-flowered unicorn-plant Proboscidea spicata Plants Not Listed Not Listed GH S1 False Dry sandy alluvial and/or Eolian soils on terraces along Rio Grande or in other disturbed sandy habitats; flowering May-June (-August)
Havard plum Prunus havardii Plants Not Listed Not Listed G3 S3 False Local in limestone canyons, on igneous talus slopes and novaculite outcrops; Perennial; Flowering March-July; Fruiting June-Oct
Texas almond Prunus minutiflora Plants Not Listed Not Listed G3G4 S3S4 True Wide-ranging but scarce, in a variety of grassland and shrubland situations, mostly on calcareous soils underlain by limestone but occasionally in sandier neutral soils underlain by granite; Perennial; Flowering Feb-May and Oct; Fruiting Feb-Sept
Texas peachbush Prunus texana Plants Not Listed Not Listed G3G4 S3S4 True Occurs at scattered sites in various well drained sandy situations; deep sand, plains and sand hills, grasslands, oak woods, 0-200 m elevation; Perennial; Flowering Feb-Mar; Fruiting Apr-Jun
cienega false clappia-bush Pseudoclappia arenaria Plants Not Listed Not Listed G3 S3 False Mostly in alkali sacaton (Sporobolus airoides) grasslands on alkaline, gypseous or saline soils of alluvial flats around cienegas, playa lakes and other desert wetlands; Perennial; Flowering spring-summer
Watson's false clappia-bush Pseudoclappia watsonii Plants Not Listed Not Listed G1 S1 True Chihuahuan Desert shrublands on dry, rocky, gypseous clay hills and arroyos; flowering May-August
long-ray pseudocymopterus Pseudocymopterus longiradiatus Plants Not Listed Not Listed G4? S3 False Various mountain ranges in Brewster, Culberson and Jeff Davis counties; in shady, damp, sandy or rocky places in canyons in the mountains of the Trans Pecos; Perennial
Arizona cudweed Pseudognaphalium arizonicum Plants Not Listed Not Listed G3G4 S3 False Along or near springs and creeks in oak and pine woodlands at high elevations (known locations are at 6500-7500 ft) (Nesom 2000). Aug-Oct.
South Texas false cudweed Pseudognaphalium austrotexanum Plants Not Listed Not Listed G3 S3 False In sandy grasslands on eroded area above saline flats; along edge of sendero through mesquite woodland and shrub mottes on sandy loam; on gravel and silt bars and flats in scour plain of streams (TEX-LL specimens Carr 23682, 29264, 22647, 27206). Oct-Jan, sometimes in spring.
Welder machaeranthera Psilactis heterocarpa Plants Not Listed Not Listed G2G3 S2S3 True Grasslands , varying from midgrass coastal prairies, and open mesquite-huisache woodlands on nearly level, gray to dark gray clayey to silty soils; known locations mapped on Victoria clay, Edroy clay, Dacosta sandy clay loam over Beaumont and Lissie formations; flowering September-November
Arkansas oak Quercus arkansana Plants Not Listed Not Listed G3 S1 False At the Cass County location, it occurs with Quercus stellata, Q. marilandica and Q. incana in a young pine plantation on deep sandy soils; Perennial; Flowering spring
Boynton's oak Quercus boyntonii Plants Not Listed Not Listed G1 SH False Loblolly pine-oak forests on deep, sandy soils in creek bottoms; possibly also in shallower soils of upland prairies; flowering in the spring
Sierra del Carmen oak Quercus carmenensis Plants Not Listed Not Listed G2? S1 False Shrublands and woodlands on talus slopes at 2,200-2,500 m (7,200-8,200 ft) elevation; immature fruit collected in July
Mexican dwarf oak Quercus depressipes Plants Not Listed Not Listed G3 S1 False Thin mountain soils on rocky slopes in grasslands, chaparral, and open woodlands at 2,100-2,600 m (6,900-8,500 ft) elevation; known in Texas from west and northwest facing slopes of Mount Livermore; flowering in the spring
Chisos oak Quercus graciliformis Plants Not Listed Not Listed G1 S1 True Oak woodlands in dry rocky canyons, usually associated with a high water table; in moister portions of canyons of the Chisos Mountains, above elevations of 1650 m (5400 ft); flowering in the spring, fruiting July-early September
Hinckley's oak Quercus hinckleyi Plants LT T G2 S2 False Creosote bush-mariola or lechuguilla-sotol shrublands on arid limestone slopes at mid-elevations in Chihuahuan Desert; flowering in spring, produces acorns late August-early September
robust oak Quercus robusta Plants Not Listed Not Listed G1Q S1 True Mixed evergreen-deciduous woodlands in moist canyon bottoms at elevations ca. 1,280 m (4,200 ft) in foothills of the Chisos Mountains; flowering in th spring
lateleaf oak Quercus tardifolia Plants Not Listed Not Listed G1 S1 False Mixed evergreen-deciduous woodlands in moist canyon bottoms at elevation ca. 2,150 m (7,050 ft) in the Chisos Mountains; flowering in the spring