Species of Greatest Conservation Need
1124 species
| Scientifc Name | Common Name | Taxonomic Group | SGCN Status | Federal Status | State Status | Global Rank | State Rank | Endemic | General Habitat Type(s) |
|---|---|---|---|---|---|---|---|---|---|
| Poa strictiramea | Big Bend bluegrass | Plants | Yes | Not Listed | Not Listed | G3 | S1 | No | Grasslands and open oak woodlands on igneous soils on rocky slopes above 1,800 m (5,900 ft) in the Chisos Mountains; in Mexico, found mostly on steep, north-facing slopes and cliff bases from the highest elevation creosote bush shrublands to mid-elevation pine-oak woodlands, on both igneous and limestone substrates; flowering May-September |
| Polanisia erosa ssp. breviglandulosa | South Texas yellow clammyweed | Plants | Yes | Not Listed | Not Listed | G5T3T4 | S3S4 | Yes | Sand plains of south Texas (Iltis 1958). Flowering early spring-mid fall. |
| Polemonium pauciflorum ssp. hinckleyi | Hinckley's Jacob's-ladder | Plants | Yes | Not Listed | Not Listed | G3G5T2Q | S1 | No | A substantial population in the Davis Mountains occurs in a perennially mesic canyon and shaded talus boulder field on an igneous slope, elevation 2,100-2,300 m (6,900-7,550 ft), in the shade of a pine-oak-juniper forest; flowering July-October |
| Polygonella parksii | Parks' jointweed | Plants | Yes | Not Listed | Not Listed | G2 | S2 | Yes | 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 |
| Pomaria austrotexana | stinking rushpea | Plants | Yes | Not Listed | Not Listed | G3 | S3 | No | In open areas on deep well drained sands; Perennial; Flowering Feb-Oct; Fruiting April-Oct |
| Pomaria brachycarpa | broadpod rushpea | Plants | Yes | Not Listed | Not Listed | G2 | S2 | Yes | 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 |
| Potamogeton clystocarpus | Little Aguja pondweed | Plants | Yes | E 11/14/1991 |
E 03/30/1993 |
G1 | S1 | Yes | 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 |
| Prenanthes barbata | barbed rattlesnake-root | Plants | Yes | Not Listed | Not Listed | G3 | S3 | No | 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 |
| Prenanthes carrii | canyon rattlesnake-root | Plants | Yes | Not Listed | Not Listed | G2 | S2 | Yes | 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 |
| Proboscidea sabulosa | dune unicorn-plant | Plants | Yes | Not Listed | Not Listed | G3 | S2 | No | 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 |
| Proboscidea spicata | many-flowered unicorn-plant | Plants | Yes | Not Listed | Not Listed | G1 | S1 | No | Dry sandy alluvial and/or Eolian soils on terraces along Rio Grande or in other disturbed sandy habitats; flowering May-June (-August) |
| Prunus havardii | Havard plum | Plants | Yes | Not Listed | Not Listed | G3 | S3 | No | Local in limestone canyons, on igneous talus slopes and novaculite outcrops; Perennial; Flowering March-July; Fruiting June-Oct |
| Prunus minutiflora | Texas almond | Plants | Yes | Not Listed | Not Listed | G3G4 | S3S4 | Yes | 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 |
| Prunus murrayana | Murray's plum | Plants | Yes | Not Listed | Not Listed | G2 | S2 | Yes | Deciduous woodlands on steep rocky slopes in mesic, high elevation mountain canyons on both igneous and sedimentary substrates; flowering March-April; fruiting June-August |
| Prunus texana | Texas peachbush | Plants | Yes | Not Listed | Not Listed | G3G4 | S3S4 | Yes | 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 |
| Pseudoclappia arenaria | cienega false clappia-bush | Plants | Yes | Not Listed | Not Listed | G3 | S3 | No | 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 |
| Pseudoclappia watsonii | Watson's false clappia-bush | Plants | Yes | Not Listed | Not Listed | G2 | S2 | Yes | Chihuahuan Desert shrublands on dry, rocky, gypseous clay hills and arroyos; flowering May-August |
| Pseudognaphalium arizonicum | Arizona cudweed | Plants | Yes | Not Listed | Not Listed | G3G4 | S3 | No | 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. |
| Pseudognaphalium austrotexanum | South Texas false cudweed | Plants | Yes | Not Listed | Not Listed | G3 | S3 | No | 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. |
| Psilactis heterocarpa | Welder machaeranthera | Plants | Yes | Not Listed | Not Listed | G2G3 | S2S3 | Yes | 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 |
| Quercus arkansana | Arkansas oak | Plants | Yes | Not Listed | Not Listed | G3 | S1 | No | 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 |
| Quercus boyntonii | Boynton's oak | Plants | Yes | Not Listed | Not Listed | G1 | SH | No | Loblolly pine-oak forests on deep, sandy soils in creek bottoms; possibly also in shallower soils of upland prairies; flowering in the spring |
| Quercus carmenensis | Sierra del Carmen oak | Plants | Yes | Not Listed | Not Listed | G2? | S1 | No | Shrublands and woodlands on talus slopes at 2,200-2,500 m (7,200-8,200 ft) elevation; immature fruit collected in July |
| Quercus depressipes | Mexican dwarf oak | Plants | Yes | Not Listed | Not Listed | G3 | S1 | No | 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 |
| Quercus graciliformis | Chisos oak | Plants | Yes | Not Listed | Not Listed | G1 | S1 | Yes | 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 |