Anderson's Milkvetch

Hamosa andersonii (A. Gray) Rydb. Bull. Torrey Club 54: 16. 1927.
Astragalus Andersonii A. Gray, Proc Am. Acad. 6: 524. 1865. Tragacantha Andersonii Kuntze, Rev. Gen. 943. 1891.
A perennial, with a cespitose woody caudex; stems many, 1-3 dm. high, villous-canescent; leaves ascending, 6-10 cm. long, rather long-petioled; stipules deltoid, 5-8 mm. long, acuminate, villous, the lower connate; leaflets 13-17, obovate, 8-10 mm. long, 4—6 mm. wide, villouscanescent; peduncles 3-5 cm. long; racemes dense at first, in age laxer, 3-5 cm. long; bracts subulate, 4 mm. long; calyx villous-canescent, the tube about 4 mm. long and 3 mm. wide, the teeth subulate, 3 mm. long; corolla white, or tinged with pink, about 1.5 cm. long; banner obovate; wings shorter, the blade obliquely oblanceolate, with a large basal auricle; keelpetals much shorter, the blade broadly lunate, rounded at the apex, with a large auricle; pod oblong-lunate, arcuate, 1.5-2 cm. long, 3-4 mm. wide, and 2 mm. thick, villous-canescent, slightly sulcate on the lower suture, cordate in cross-section.
Type locality: Carson City, Nevada.
Distribution: Western Nevada and eastern 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 sparsely to densely hairy, Stems hairs pilose or spreading, Stems silvery, canescent, tomentose, cobwebby, or wooly, Leaves alternate, Leaves petiolate, Stipules conspicuous, Stipules membranous or chartaceous, Stipules persistent, Stipules connate to each other, forming a tuber or sheath, Leaves compound, Leaves odd pinnate, Leaf or leaflet margins entire, Leaflets opposite, Leaflets 10-many, Leaves hairy on one or both surfaces, Inflorescence panicles, Inflorescences spikes or spike-like, Inflorescences globose heads, capitate or subcapitate, Inflorescence axillary, Bracts very small, absent or caducous, Flowers zygomorphic, Calyx 5-lobed, Calyx glabrous, Petals separate, Corolla papilionaceous, Petals clawed, Petals white, 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 tardily or weakly dehiscent, Fruit oblong or ellipsoidal, Fruit strongly curved, falcate, bent, or lunate, Fruit coriaceous or becoming woody, Fruit exserted f rom calyx, Fruit beaked, Fruit hairy, Fruit 3-10 seeded, Fruit 11-many seeded, Seeds cordiform, mit-shaped, notched at one end, Seed surface smooth, Seeds olive, brown, or black.

Astragalus andersonii is a species of milkvetch known by the common name Anderson's milkvetch. It is native to eastern California and western Nevada, where it is found in the plateaus at the foot of the Sierra Nevada, including the Modoc Plateau. It was named after Charles Lewis Anderson by Asa Gray.