Astragalus adanus A. Nelson

Cnemidophacos adanus (A. Nelson) Rydberg
Astragalus adanus A. Nelson, Bot. Gaz. 53: 222. 1912. Ctenophyllum adanum Rydb. Fl. Rocky Mts. 502, 1063. 1917.
A perennial, with a woody root and cespitose caudex; stems numerous, glabrate or sparingly strigose, striate, 2-4 dm. high; leaves numerous, 1-2 dm. long, the rachis sparingly pubescent; stipules scarious, deltoid, acuminate, 4-5 mm. long; leaflets 13-25, oblong to obovate, 7-14 mm. long, glabrous above, sparingly strigose beneath; peduncles strict, 7-12 cm. long; racemes 3-6 cm. long, 5-15-flowered; bracts lance-subulate, 2-5 mm. long; pedicels 2 mm. long; calyx sparingly black-hairy, the tube 4—5 mm. long, the teeth subulate, 1 .5 mm. long; corolla ochroleucous, resembling that of C. reventus but smaller ; pod obliquely ovoid , rounded at the base, short -acuminate at the apex, cross-reticulate, about 1 cm. long, 6 mm. thick and 5 mm. wide .
Type locality: Boise Hills, Idaho.
Distribution: Idaho.

Perennial, Herbs, Stems woody below, or from woody crown or caudex, Taproot present, Nodules present, Stems erect or ascending, Stems less than 1 m tall, Stems solid, Stems or young twigs sparsely to densely hairy, Stem hairs hispid to villous, 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 glabrous, Petals separate, Corolla papilionaceous, Petals cla wed, 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, 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 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.

Astragalus adanus adalah spesies tumbuhan yang tergolong ke dalam famili Fabaceae. Spesies ini juga merupakan bagian dari ordo Fabales. Spesies Astragalus adanus sendiri merupakan bagian dari genus Astragalus. Nama ilmiah dari spesies ini pertama kali diterbitkan oleh A.Nelson.

Astragalus adanus là một loài thực vật có hoa trong họ Đậu. Loài này được A.Nelson miêu tả khoa học đầu tiên.