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)
Johnston's phlox Phlox drummondii ssp. johnstonii Plants Not Listed Not Listed G5T3 S3 True Found on sandy soils; Annual; Flowering/Fruiting April-June
Texas trailing phlox Phlox nivalis ssp. texensis Plants LE E G4T2 S2 True Relatively open fire-maintained pine or pine-hardwood forests on soils with a deep, sandy surface layer and clayey subsurface layers; flowering late March-early April (-May)
Oklahoma phlox Phlox oklahomensis Plants Not Listed Not Listed G3 SH False Known from a 1958 collection from an oak woodland four miles east of Garland, Texas (Carr 2015).
Trans-Pecos maidenbush Phyllanthopsis arida Plants Not Listed Not Listed G2Q S1 False Crevices in calcareous bedrock exposures on arid mountain slopes, usually with succulents, Texas sites are on Cretaceous limestone; Mexican sites differ; flowering July-October
sand sheet leaf-flower Phyllanthus abnormis var. riograndensis Plants Not Listed Not Listed G5T3 S3 True Semi-desert scrub of deep South Texas; Annual; Flowering Feb-July; Fruiting Oct-March
heather leaf-flower Phyllanthus ericoides Plants Not Listed Not Listed G2 S1 False Crevices in limestone on dry canyon walls and other rock outcrops; flowering October, and presumably in other months, given sufficient moisture
threadleaf bladderpod Physaria angustifolia Plants Not Listed Not Listed G3 S1 False Limestone glades or chalk outcrops on the Annona and other Cretaceous formations (Carr 2011). March - May.
Engelmann's bladderpod Physaria engelmannii Plants Not Listed Not Listed G4 S3 False Grasslands and calcareous rock outcrops in a band along the eastern edge of the Edwards Plateau, ranging as far north as the Red River (Carr 2015).
McVaugh's bladderpod Physaria mcvaughiana Plants Not Listed Not Listed G3 S3 False Grasslands on rocky limestone uplands at moderate elevations; Stream bed gravels, rocky limestone slopes and hills, canyon bottoms and slopes, limestone rubble, 1200-1600 m elevation; Perennial; Flowering/Fruiting March-Aug
white bladderpod Physaria pallida Plants LE E G1 S1 True Natural openings or glades within pine-oak forests on calcareous sandy loam over glauconite or ironstone of the Weches Formation; these glades are seep moistened during the winter and spring, but become desiccated during the summer; flowering April-May
Zapata bladderpod Physaria thamnophila Plants LE E G1G2 S1S2 False Open, thorn shrublands on shallow, well-drained sandy loams and sandstone outcrops of Eocene origin, including the Jackson Group and Yegua and Laredo formations; the known sites soils are mapped as Zapata, Maverick, Catarina, or Copita Series; flowering usually February-April, but also summer or fall depending on rainfall
strong bladderpod Physaria valida Plants Not Listed Not Listed G3 S1 False Open gravelly areas over limestone in pinyon-juniper woodlands at elevations of 900-2,000 m (2,950-6,550 ft); flowering March-May (-August)
Correll's false dragon-head Physostegia correllii Plants Not Listed Not Listed G2 S2 False Wet, silty clay loams on streamsides, in creek beds, irrigation channels and roadside drainage ditches; or seepy, mucky, sometimes gravelly soils along riverbanks or small islands in the Rio Grande; or underlain by Austin Chalk limestone along gently flowing spring-fed creek in central Texas; flowering May-September
long-sepaled false dragon-head Physostegia longisepala Plants Not Listed Not Listed G2G3 S2 False Relatively open areas on poorly drained, acid loams on level terrain over Beaumont, Deweyville, and Montgomery formations; probably originally found in fire-maintained wetland pine savannas or in the transition zone between such flatwoods and adjacent coastal prairies, now found primarily in secondary habitats, such as wet borrow ditches along roadsides and moist areas in human-made clearings in pine woodlands; flowering early May-early July
little rock lettuce Pinaropappus parvus Plants Not Listed Not Listed G3 S3 False Occurs on limestone cliff faces and among boulders on mountain slopes, in oak-pine, juniper and chaparral zones, at altitudes ranging from 1500 to 2200 meters; Perennial; Flowering June-July; Fruiting July
pino real Pinus arizonica var. stormiae Plants Not Listed Not Listed G4T3 S1 False Known from a few sites in the Chisos Mountains (Powell 1998) (Carr 2015)
Chapman's orchid Platanthera chapmanii Plants Not Listed Not Listed G2 S1 False In Texas, appears restricted to wetland pine savannas and savanna swales in hillside seepage bogs, two very restricted and declining habitats in the State; flowering July-August
yellow fringeless orchid Platanthera integra Plants Not Listed Not Listed G3G4 S1 False Currently known only from a few bog sites in Angelina, Jasper and Newton counties; Perennial; Flowering/Fruiting Aug
Big Bend bluegrass Poa strictiramea Plants Not Listed Not Listed G3 S1 False 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
South Texas yellow clammyweed Polanisia erosa ssp. breviglandulosa Plants Not Listed Not Listed G5T3T4 S3S4 True Sand plains of south Texas (Iltis 1958). Flowering early spring-mid fall.
Hinckley's Jacob's-ladder Polemonium pauciflorum ssp. hinckleyi Plants Not Listed Not Listed G3G5T2Q S1 False 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
Hooker's milkwort Polygala hookeri Plants Not Listed Not Listed G3 S2 False Freshwater Wetland
Maravillas milkwort Polygala maravillasensis Plants Not Listed Not Listed G2 S1 False Crevices of limestone exposed on canyons walls, along the Rio Grande and its tributaries, and in low desert mountains at 450-950 m (1,450-3,100 ft) elevation; appears restricted to the area of the Lower Canyons of the Rio Grande and lower Boquillas Canyon on both sides of the border; flowering May-October
Palmer's milkwort Polygala palmeri Plants Not Listed Not Listed G3 S2 False Limestone slopes; Perennial; Flowering April-July; Fruiting June-Oct
rock crevice milkwort Polygala rimulicola var. rimulicola Plants Not Listed Not Listed G3T3 S2 False Barren/Sparse Vegetation (limestone canyon walls, outcrops, and boudlers)