Astragalus lyallii A. Gray

Astragalus lyallii A. Gray, Proc. Am. Acad. 6: 195. 1864
Tragacanlha Lyallii Kuntze, Rev. Gen. 246. 1891.
Phaca Lyallii Piper, Contr. U. S. Nat. Herb. 11: 370. 1906.
Astragalus Lyallii caricinus M. E. Jones, Rev. Astrag. 174. 1923.
A perennial, with a cespitose woody caudex; stems numerous, 2-5 dm. high, villous, terete, flexuose; leaves ascending, 5-10 cm. long; stipules subulate, 3-5 mm. long; leaflets 13-17, villous, oblong to linear-lanceolate, acute at each end, 1-1.5 cm. long, 2-4 mm. wide; peduncles 4-6 cm. long; racemes elongate, 4-10 cm. long, lax; bracts subulate, 3-4 mm. long; flowers reflexed; pedicels 1 mm. long; calyx villous, the tube 2 mm. long, the teeth subulate, 3 mm. long; corolla white, 6-7 mm. long; banner obovate, striate, strongly arched at the middle; wings shorter, the blade obliquely oblanceolate, falcate, with a prominent auricle; keel-petals shorter, the blade broadly lunate, strongly arched, obtuse; pod villous, lance-oblong, somewhat laterally compressed, 6-7 mm. long, 3 mm. wide and thick, cordate in cross-section; seeds few.
Type locality: Upper Yakima River. Washington.
Distribution: Washington and 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, 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, Inflorescences racemes, Inflorescence axillary, Bracts very small, absent or caducous, Flowers zygomorphic, Calyx 5-lobed, Calyx glabrous, Petals separate, Corolla papilionaceous, Petals clawed, Petals white, Petals blue, lavander to purple, or violet, 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 stipitate, Fruit tardily or weakly dehiscent, Fruit oblong or ellipsoidal, Fruit exserted from calyx, Fruit beaked, Fruit hairy, Fruit 3-10 seeded, Seeds cordiform, mit-shaped, notched at one end, Seed surface smooth, Seeds olive, brown, or black.

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

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