Lupinus clarkei Oerst.

Normally annual branched herb to 1.5 m tall, mature stems terete, rigid, puberulent to tomentose, the twigs drying minutely angled. Leaves 5-7 digitately compound, the leaflets 3.5-4.5 cm long, 6-10 mm wide, narrowly ovate to ob-lanceolate, apically obtuse or rounded, mucronulate, basally narrowed into the indistinct petiolule, the costa prominent, conspicuously elevated beneath, sub-plane above, the lamina glabrate to sparsely pubescent on both sides, the hairs spreading and curled, to 1 mm long, shorter and denser beneath, the margins pilose, the undersides with a whitish bloom; petiolules to 1 mm long; petioles slender, 3-5 cm long, slightly exceeding the leaves; stipules narrowly deltoid to linear subulate, ca. 3 mm long, dark, pubescent. Inflorescences showy terminal racemes, blue or purple with pinkish or reddish tinges, the rachis tomentose with curved hairs and moniliform hairs to 1 mm long, 6-15 cm long, the flowers un-crowded on pedicels ca. 3 mm long. Flowers with the calyx deeply divided, the lower lip somewhat reflexed, 4-5 mm long, entire or 3-denticulate tomentulose,