Comanche Peak Prairie Clover

Petalostemon reverchoni S. Wats. Proc. Am. Acad 21:449. 1886.
Kuhnistera Reverchoni A. Heller, Bull. Torrey Club 23: 124. 1896.
A perennial, branched at the base; stems diffuse, 1-2 dm. long, finely pubescent; leaves 2-3 cm. long; stipules subulate; leaflets 5-11, linear or linear-oblanceolate, glabrous, 5-10 mm. long, acutish, somewhat involute; spikes sessile, subglobose or oblong, in fruit 1-7 cm. long, about 1 cm. thick; bracts shorter than the calyces, deciduous, silky throughout, lanceolate, acuminate; calyx about 4 mm. long, appressed, silky; lobes deltoid, acute or acuminate, about equaling the tube; corolla deep-pink; pods silky, obliquely obovate, 3 mm. long.
Type locality: Rocky top of Comanche Peak, Texas. Distribution : Texas.

Perennial, Herbs, Taproot present, Nodules present, Stems or branches arching, spreading or decumbent, Stems less than 1 m tall, Stems solid, Stems or young twigs sparsely to densely hairy, Stem hairs hispid to villous, Leaves alternate, Leaves petiolate, Stipules inconspicuous, absent, or caducous, Stipules setiform, subulate or acicular, Stipules deciduous, Stipules free, Leaves compound, Leave s odd pinnate, Leaf or leaflet margins entire, Leaflets opposite, Leaflets 5-9, Leaves glandular punctate or gland-dotted, Leaves glabrous or nearly so, Inflorescences spikes or spike-like, Inflorescence terminal, Bracts conspicuously present, Calyx 5-lobed, Calyx hairy, Petals separate, Petals clawed, Petals blue, lavander to purple, or violet, Banner petal narrow or oblanceolate, Banner petal ovoid or obovate, Wing petals narrow, oblanceolate to oblong, Wing tips obtuse or rounded, Keel tips obtuse or rounded, not beaked, Fertile stamens 5, Stamens monadelphous, united below, Filaments glabrous, Style terete, Fruit a legume, Fruit unilocular, Fruit indehiscent, Fruit elongate, straight, Fruit oblong or ellipsoidal, Fruit enclosed in calyx, Fruit glabrous or glabrate, Fruit hairy, Fruit 1-seeded, Seeds reniform, Seeds cordiform, mit-shaped, notched at one end, Seed surface smooth, Seeds olive, brown, or black.

Dalea reverchonii is a species of flowering plant in the legume family known by the common name Comanche Peak prairie-clover. It is endemic to Texas in the United States, where it is known from Bosque, Erath, Hood, Johnson, Parker, Somervell, Tarrant, and Wise counties. This species was first collected by Julien Reverchon at the top of Comanche Peak. As of 2015 the species still grows there.

This perennial herb forms a mat-like rosette with smooth leaves each divided into several leaflets. It blooms in spikes of pink or purplish flowers in May and June.

This plant grows on grassland terrain and in openings in oak woodland dominated by post oak (Quercus stellata). It may grow on barren sites with little vegetation. The substrate is clay over limestone. Associated plants include Aristida spp., Bouteloua rigidiseta, Arenaria stricta, Dalea aurea, D. enneandra, D. tenuis, Evolvulus nuttallianus, Hedeoma drummondii, Hedyotis nigricans, Heliotropium tenellum, Indigofera miniata var. leptosepala, Paronychia virginica, Pediomelum reverchonii, Salvia texana, and Thelesperma filifolium.

There are 69 populations as of 2013.