Blue Mountain Milkvetch

Cnemidophacos reventus (A. Grav) Rvdb. Bull. Torrey Club 40:52. 1913.
Astragalus reventus A. Gray, Proc. Am. Acad. 15: 46. 1879. Astragalus reventus Canbyi M. E. Jones. Contr. W. Bot. 8:11. 1898. Phaca reventa Piper, Contr. U. S. Nat. Herb. 11: 372. 1906.
A perennial, with a cespitose caudex; stem angled, sparingly pilose or glabrate, 1-2 dm. high; leaves ascending, 1-1.5 dm. long; stipules deltoid, 4-5 mm. long; leaflets 25-31, oblong, 10—15 mm. long, 2-7 mm. wide, glabrous above, villous or pilose with curved hairs beneath, obtuse or retuse at the apex; peduncles 1-2 dm. long, sparingly pilose; racemes about 5 cm. long; bracts lanceolate, 3— 5 mm. long; flowers nodding in anthesis; calyx loosely pilose, more or less black-hairy, the tube 7 mm. long, 3 mm. broad, the teeth subulate, 3 mm. long; corolla white, fully 2 cm. long; banner broadly obovate, rather abruptly arched; wings with broadly oblong blades; keel-petals much shorter, the blade broadly lunate; pod obliquely ovoid, crosswrinkled, about 2.5 cm. long, 1 cm. thick, glabrous, neither suture inflexed, the upper prominent.
Type locality: Grand Valley and Blue Mountains. Oregon.
Distribution: Northeastern Oregon.

Perennial, Herbs, Stems woody below, or from woody crown or caudex, Taproot present, Nodules present, Stems erect or ascend ing, Stems or branches arching, spreading or decumbent, Stems less than 1 m tall, Stems solid, Stems or young twigs sparsely to densely hairy, Leaves alternate, Leaves petiolate, Stipules conspicuous, Stipules membranous or chartaceous, Stipules persistent, Stipules free, Leaves compound, Leaves odd pinnate, Leaf or leaflet margins entire, Leaflets opposite, Leaflets 10-many, Leaves hairy on one or both surfaces, Inflorescences racemes, Inflorescence axillary, Bracts very small, absent or caducous, Flowers zygomorphic, Calyx 5-lobed, Calyx hairy, Petals separate, Corolla papilionaceous, Petals clawed, Petals ochroleucous, cream colored, Banner petal narrow or oblanceolate, Wing petals narrow, oblanceolate to oblong, Wing tips obtuse or rounded, Keel petals auriculate, spurred, or gibbous, Keel tips obtuse or rounded, not beaked, Stamens 9-10, Stamens diadelphous, 9 united, 1 free, Filaments glabrous, Style terete, Style persistent in fruit, Fruit a legume, Fruit unilocular, Fruit freely dehiscent, Fruit oblong or ellipsoidal, Fruit rugose wrinkled or reticulate, Fruit or valves persistent on stem, Fruit fleshy, Fruit coriaceous or becoming woody, Fruit exserted from calyx, Fruit beaked, Fruit glabrous or glabrate, Fruit 11-many seeded, Seeds cordiform, mit-shaped, notched at one end, Seed surface smooth, Seeds olive, brown, or black.