Astragalus robbinsii (Oakes) A. Gray

Atelophragma robbinsii (Oakes) Rydb. Bull. Torrey Club 55: 124. 1928.
Phaca Robbinsii Oakes, Mag. Hort. Hovey 7: 181. 1841.
Astragalus Robbinsii A. Gray. Man. ed. 2. 98. 1856.
Tragacantha Robbinsii Kuntze. Rev. Gen. 947. 1891.
Astragalus labradoricus Robbinsii M. E. Jones, Rev. Astrag. 134. 1923.
A perennial, with a cespitose rootstock; stems 2-4 dm. long, slender, decumbent at the base, sulcate, glabrous or nearly so; leaves ascending, 5-8 cm. long; stipules ovate or lanceolate, 4—5 mm. long; leaflets 9-13, elliptic or oblong, rounded or slightly retuse at the apex, glabrous above, sparingly strigose beneath; peduncles 10-15 cm. long; racemes 2-3 cm. long, in fruit 5-10 cm. long; bracts scarious, lanceolate; pedicels 1 mm. long; calyx sparingly black-hairy; corolla white, 8 mm. long; banner obovate, slightly notched, moderately arched; wings nearly as long, the blade oblong, falcate, with a long basal auricle; keel-petals shorter, the blade broadly lunate, more strongly arched towards the obtuse apex; pod stipitate, sparingly and minutely black-hairy, the stipe 4 mm. long, the body lunate, 12-15 mm. long, 4 mm. wide, abruptly acute at each end, the lower suture straight or slightly concave, the septum about 0.25 mm. wide, the cross-section obovate; seeds obliquely reniform, 2.5 mm. long.
Type locality: On the banks of Onion [Winooski| River, near Burlington. Vermqjit.
Distribution: Known only from the type locality.

Perennial, Herbs, Stems woody below, or from woody crown or caudex, Nodules present, Stems erect or ascending, Stems less than 1 m tall, Stems solid, Stems or young twigs sparsely to densely hairy, Stems hairs pilose or spreading, 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 compou nd, Leaves odd pinnate, Leaf or leaflet margins entire, Leaflets opposite, Leaflets 5-9, 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 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 elongate, straight, Fruit oblong or ellipsoidal, Fruit or valves persistent on stem, Fruit exserted from calyx, Fruit beaked, Fruit hairy, Fruit 11-many seeded, Seeds cordiform, mit-shaped, notched at one end, Seed su rface smooth, Seeds olive, brown, or black.

Astragalus robbinsii is a species of milkvetch known by the common name Robbins's milkvetch. It is native to North America, where it is widespread with several varieties originating from different regions.

A. r. var. alpiniformis is endemic to Oregon. A. r. var. fernaldii is known from Quebec and Newfoundland and Labrador. A. r. var. harringtonii is endemic to Alaska. A. r. var. jesupii is a rare variety known only from three locations on the Connecticut River in New Hampshire and Vermont and is a federally listed endangered species. A. r. var. minor, the most widespread variety, can be found in western North America and eastern Canada. A. r. var. occidentalis is a rare variety endemic to the Ruby Mountains of Nevada. A. r. var. robbinsii is endemic to Vermont.

Astragalus robbinsii est une espèce végétale de la famille des Fabaceae.

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

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