Mexican Prairie Clover

Parosela exserta Rydberg, sp. nov
A low annual; stem about 2 dm. high, glabrous, striate, sparingly glandular-dotted; leaves 3-4 c m. long; stipules subulate, minute; rachis glabrous; stipels conic, gland-like; leaflets 13-17, oblong, 5—8 mm. long, glabrous, minutely glandular beneath; peduncles 5-8 cm. long; spikes dense, 3-6 cm. long, 12 mm. thick; bracts lanceolate, acuminate, deciduous, glabrous, glandular-dotted on the upper half; calyx-tube 4 mm. long, campanulate, membranous, glabrous, with a row of conspicuous oblong glands between the 10 veins; lobes filiform from a lanceolate base, plumose-pilose, 3 mm. long; corolla purplish-blue; blade of the banner cordate, 3.5 mm. long, the claw 2.5 mm. long; blades of the wings and keel-petals with the basal lobe rather poorly developed, 2 mm. long, the claws about 0.5 mm. long; pod membranous, slightly pilose and glandular at the summit.
Type collected at Colima, February 27 and 28, 1891, Edward Palmer 1312 (U. S. Nat. Herb. no. 208865).

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 odd pinnate, Leaf or leaflet margins entire, Leaflets opposite, Leaflets 10-many, 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 glabrous, Petals separate, Corolla papilionaceous, Petal s clawed, Petals white, 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, Stamens monadelphous, united below, Stamens long exserted, Filaments glabrous, Style terete, Fruit a legume, Fruit unilocular, Fruit indehiscent, Fruit elongate, straight, Fruit oblong or ellipsoidal, Fruit enclosed in calyx, Fruit hairy, Fruit gland-dotted or with gland-tipped hairs, Fruit 1-seeded, Seeds reniform, Seeds cordiform, mit-shaped, notched at one end, Seed surface smooth, Seeds olive, brown, or black.