Tephrosia potosina Brandegee

Cracca potosina (Brand.) Rydberg
Tephrosia potosina Brand. Univ. Calif. Publ. Bot. 4: 272. 1912.
A perennial herb, with a woody root; stem decumbent, flexuous, densely hirsute-pilose; leaves 1-1.5 dm. long; stipules linear-lanceolate, hirsute, S mm. long; petiole 4-6 cm. long; rachis hirsute-pilose; leaflets 3-7, broadly obovate to orbicular, rounded or retuse at the ap^x, 2 5 3 5 nn long, 2-3 cm. wide, glabrous above, hirsute-pilose beneath; racemes subopposite the leaves, 1.5-2 dm. long, about 12-flowered; flowers mostly 2 at each node; calyx densely hirsute, the tube 2 mm. long, the lobes lance-subulate, 3 mm. long; corolla purplish, about 12 mm. long; banner obovate, silky-strigose without; pod about 5 cm long, Ji mm wide, acute at each end, densely hirsute-pilose, about 6-seeded.
Typb locality: Near Rascon, San Luis Potosi. Distribution: San I.uis Potosi and Nuevo Le6n.

Perennial, Herbs, Stems woody below, or from woody crown or caudex, 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 persistent, Stipules free, Leaves compound, Leaves odd pinnate, Leaf or leaflet margins entire, Leaflets opposite, Leaflets 5-9, Leaves hairy on one or both sur faces, Inflorescences racemes, Inflorescence terminal, Inflorescence leaf-opposed, Bracts conspicuously present, Flowers zygomorphic, Calyx 5-lobed, Calyx hairy, Petals separate, Corolla papilionaceous, Petals clawed, Petals pinkish to rose, Petals blue, lavander to purple, or violet, Banner petal ovoid or obovate, Banner petal suborbicular, broadly rounded, Wing petals narrow, oblanceolate to oblong, Wing petals auriculate, Wing tips obtuse or rounded, Keel petals auriculate, spurred, or gibbous, Keel tips obtuse or rounded, not beaked, Stamens 9-10, Stamens monadelphous, united below, Filaments glabrous, Style terete, Style sharply bent, Style hairy, Style hairy on one side only, Fruit a legume, Fruit unilocular, Fruit freely dehiscent, Fruit elongate, straight, Fruit exserted from calyx, Valves twisting or coiling after dehiscence, Fruit beaked, Fruit hairy, Fruit 3-10 seeded, Seeds ovoid to rounded in outline, Seed surface smooth, Seeds olive, brown, or black, Seed surfa ce mottled or patchy.

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