Bald Mountain Milkvetch

Hamosa umbratica (Sheldon) Rydb. Bull. Torrey Club
54: 19. 1927.
Astragalus sylvalicus S. Wats. Proc. Am. Acad. 23: 262. 1888. Not .4. sylvaticus Willd. 1803. Astragalus umbraiicus Sheldon, Minn. Bot. Stud. 9: 23. 1894.
A perennial; stems several from a short crown, 3-6 dm. high, erect, striate, glabrous, straw-colored; leaves ascending, 7-12 cm. long; stipules lanceolate, acuminate, about 8 mm. long ; leaflets 1 7-2 1 , oval to elliptic-oblong, usually retuse at the apex, thin, glabrous ; peduncles 6-10 cm. long; racemes 2-5 cm. long, rather many-flowered; bracts lance-subulate, about 3 mm. long; pedicels 2-3 mm. long; calyx sparingly black-hairy, the teeth lance-subulate, 2 mm. long; corolla white or ochroleucous, about 1 cm. long; banner obovate, abruptly arcuate, notched; wings a little shorter, the blade oblong-oblanceolate, falcate, obtuse or rounded at the apex; keel-petals slightly shorter, the blade strongly curved, broadly lunate, rounded at the apex; pod glabrous and shining, reflexed, strongly and regularly arched, tapering at each end, 2 cm. long, 3 mm. wide, and 2 mm. thick, deeply sulcate on the lower suture, narrowly cordate in cross-section.
Type locality: Glendale, southern Oregon.
Distribution: Oregon and northern California.

Perennial, Herbs, Stems woody below, or from woody crown or caudex, Taproot present, Nodules present, Stems erect or ascending, Stems or branches arching, spreading or decumbent, Stems less than 1 m tall, Stems solid, Stems or young twigs glabrous or sparsely glabrate, 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 white, Petals ochroleucous, cream colored, Petals greenish yellow, Banne r 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 tardily or weakly dehiscent, Fruit oblong or ellipsoidal, Fruit strongly curved, falcate, bent, or lunate, 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.

Astragalus umbraticus is a species of milkvetch known by the common name Bald Mountain milkvetch.

It is native to western Oregon and northwestern California, where it grows in the woodlands of the coastal Klamath Mountains, Outer Northern California Coast Ranges, and Oregon Coast Ranges.