Astragalus polaris Benth.

Homalobus ambiyodon (Kearney) Rydberg, sp. nov
Astragalus amblyodon Kearney, MS.
A cespitose perennial; stems less than 1 dm. long, decumbent or prostrate; leaves 1-2.5 cm. long, spreading; stipules mostly connate, broadly deltoid, 2-3 mm. long; leaflets 5-13, oval or obovate, retuse at the apex, 3-5 mm. long, glabrous above, sparingly strigose, especially along the midrib and margins beneath; peduncles 1.5-3 cm. long; racemes few-flowered, very short; bracts ovate, 1-2 mm. long, ciliate on the margins; calyx black-hairy, the tube 3 mm. long, 2 mm. broad, the teeth deltoid, obtuse, 1 mm. long; corolla purple, 10-12 mm. long; banner broadly obovate, notched at the apex; wings S-10 mm. long, the blade broadly obliquely oblanceolate, somewhat falcate, with a reflexed auricle; keel-petals slightly shorter, similar but broader; mature pod not seen; young pod 1-celled, black-hairy, neither suture reflexed, with a flat beak.
Type collected at Stepovak Bav, Alaska Peninsula, Alaska, Julv 8-19, 1899, Charles Palache (U. S. Nat. Herb. 375154).
Distribution: Known only from the type locality.

Perennial, Herbs, Stems woody below, or from woody crown or caudex, Plants with rhizomes or suckers, Taproot present, Nodules present, Stems very short, acaulescent or subacaulescent, Stems prostrate, trailing, or mat forming, 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 clasping stem at the base, Stipules connate to each other, forming a tuber or sheath, Leaves compound, Leaves odd pinnate, Leaf or leaflet margins entire, Leaflets opposite, Leaf lets 5-9, Leaflets 10-many, Leaves hairy on one or both surfaces, Flowers in axillary clusters or few-floweredracemes, 2-6 flowers, Inflorescences racemes, Inflorescence axillary, Bracts very small, absent or caducous, Flowers zygomorphic, Calyx 5-lobed, Calyx hairy, Petals separate, Corolla papilionaceous, Petals clawed, 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, 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 stipitate, Fruit unilocular, Fruit freely dehiscent, Fruit oblong or ellipsoidal, Fruit or valves persistent on stem, Fruit exserted from calyx, Fruit inflated or turgid, Fruit beaked, Fruit glabrous or glabrate, Fruit 3-10 seeded, Fruit 11-many seeded, Seeds cordiform, mit-shaped, notche d at one end, Seed surface smooth, Seeds olive, brown, or black.

Astragalus polaris adalah spesies tumbuhan yang tergolong ke dalam famili Fabaceae. Spesies ini juga merupakan bagian dari ordo Fabales. Spesies Astragalus polaris sendiri merupakan bagian dari genus Astragalus. Nama ilmiah dari spesies ini pertama kali diterbitkan oleh (Seem.) Hook..

Astragalus polaris là một loài thực vật có hoa trong họ Đậu. Loài này được (Seem.) Hook. miêu tả khoa học đầu tiên.