Sonoran Prairie Clover

Parosela filiformis (A. Gray) A. Heller, Cat. N. Am. PI. ed. 2 6. 1900.
Dalea filiformis A. Gray, PI. Wright. 2: 39. 1853.
A slender glabrous annual; stem 1-2 dm. high, with ascending branches, filiform, sparingly glandular-punctate; leaves 1.5-3 cm. long, ascending; stipules minute, subulate; petiole 510 mm. long; rachis glabrous, margined, sparingly glandular-dotted; stipels represented by small glands; leaflets 3, rarely 5, linear-filiform, 3-5 cm. long; spikes dense, short, 1 cm. long or less, 7 mm. thick; bracts deciduous, ovate, acute, ciliate, scarcely equaling the calyces; calyx-tube turbinate, silky, nearly 2 mm. long; lobes subulate, about equaling the tube; corolla purple or rose; blade of the banner broadly deltoid-ovate, nearly 2 mm. long, equaling the claw; blades of the wings and keel-petals 2 mm. long, the claws 1 mm. long; pod silky-pilose, densely so above.
Type locality: Copper Mines [Santa Rita del Cobre], New Mexico. Distribution: New Mexico, Arizona, and Chihuahua.

Annual, Herbs, Taproot present, Nodules present, Stems erect or ascending, Stems less than 1 m tall, Plants gland-dotted or with gland-tipped hairs, Stems solid, Stems or young twigs glabrous or sparsely glabrate, Leaves alternate, Leaves petiolate, Stipules inconspicuous, absent, or caducous, Stipules setiform, subulate or acicular, Stipules deciduous, Stipules free, Leaves compound, Leaves pinnately 3-foliolate, Leaves odd pinnate, Leaf or leaflet margins entire, Leaflets opposite, Leaflets 3, Leaflets 5-9, Leaves glandular punctate or gland-dotted, Leaves glabrous or nearly so, Inflorescences spikes or spike-like, Inflorescence terminal , Bracts conspicuously present, Bracteoles present, Calyx 5-lobed, Calyx hairy, Petals separate, Corolla papilionaceous, Petals clawed, Petals pinkish to rose, Petals blue, lavander to purple, or violet, Petals bicolored or with red, purple or yellow streaks or spots, 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, Stamens 9-10, 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 1-seeded, Seeds reniform, Seeds cordiform, mit-shaped, notched at one end, Seed surface smooth, Seeds olive, brown, or black.