Green River Milkvetch

Phaca pubentissima (T. & G.) Rydb. Bull. Torrey Club
40: 48. 1913.
Astragalus multicaulis Nutt.; T. & G. Fl. N. Am. 1: 335. 1838. Not .4. multicaulis Ledeb. 1831. Astragalus pubenlissimus T. & G. Fl. N. Am. 1: 693. 1840. Tragacanlha pubentissima Kuntze, Rev. Gen. 947. 1891. Astragalus Peabodyanus M. E. Jones, Zoe 3: 295. 1893.
Perennial, with a deep root; stems several, branched, about 1 dm. high or less, canescent strigose; leaves 3-5 cm. long, ascending; stipules deltoid, membranous, 3 mm. long; leaflets 7-13, obovate, 3-6 mm. long, obtuse, canescent with long ascending hairs; peduncles 1-3 cm. long; racemes 3-5-flowered; calyx pilose-canescent, the tube 3 mm. long, the lobes subulate, 2-2.5 mm. long; corolla S mm. long, white or tinged with purple, the keel purple-tipped; banner broadly obovate; wings nearly as long, the blade obliquely oblanceolate-arcuate, with a large basal auricle; keel-petals broader, strongly arcuate, rounded at the apex; pod sessile, villous with long hairs, obliquely ovoid, 12-14 mm. long, the lower sutuie strongly arched and gibbous, the upper more or less recurved.
Type locality: Ham's Fork of the Colorado. Wyoming. Distribution: Western Wyoming and northern Utah.

Annual, Herbs, 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 glabrous or sparsely glabrate, Stems or young twigs sparsely to densely hairy, Leaves alt ernate, 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 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 glabrous, Petals separate, Corolla papilionaceous, Petals clawed, Petals pinkish to rose, 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 unilocular, Fruit tardily or weakly dehiscent, Fruit oblong or ellipsoidal, Fruit strongly curved, falcate, bent, or lunate, Fruit exserted from calyx, Fruit inflated or turgid, Fruit beaked, Fruit hairy, Fruit 11-many seeded, Seeds cordiform, mit-shaped, notched at one end, Seed surface smooth, Seeds olive, brown, or black.