Fort Wingate Milkvetch

Homalobus wingatanus (S. Wats.) A. Heller, Muhlenbergia 1: 145. 1906.
Astragalus wingatanus S. Wats. Proc. Am. Acad. 18: 192. 1883. Astragalus wingalensis M. E. Jones, Proc. Calif. Acad. II. 5: 636. 1895. Homalobus wingalensis Rydb. Bull. Torrey Club 31: 563. 1904.
A perennial, with a cespitose caudex; stems 1.5-3 dm. high, strigose; stipules scarious, deltoid, acuminate, connate, 5 mm. long; leaves 3-6 dm. long; leaflets 9-13, linear-oblong or oblanceolate, 6-15 mm. long, 2-3 mm. wide, grayish-green, glabrous above, strigose beneath; racemes rather lax, 10-16-flowered, including the peduncle 10-15 cm. long; calyx strigose with mixed black and white hairs, the tube scarcely 2 mm. long, the teeth subulate, 1 mm. long; corolla white, tinged with purple, and the keel tipped with purple; banner 6 mm. long, obovate; wings and keel-petals about 5 mm. long, the latter with a rounded tip; pod oblong, acute at each end, sessile, glabrous, 10-22 mm. long, 4 mm. wide; seeds obliquely reniform, 3 mm. long, 2 mm. broad.
Type locality: Fort Wingate. New Mexico.
Distribution: New Mexico, Southern Colorado, and southeastern Utah.

Homalobus acerbus (Sheldon) Rydb. Bull. Torrey Club 32: 666. 1906.
Astragalus acerbus Sheldon. Minn. Bot. Stud. 1: 123. 1894.
Astragalus tenellus f. acerbus F. Macbr. Contr. Gray Herb. 65: 35. 1922.
A perennial, with a cespitose caudex; stems white-strigose, 3-3.5 dm. high, erect, striate below; stipules triangular-ovate, 1-2 mm. long, scarious; leaves 2.5-5 cm. long, the rachis sulcate above; leaflets 5-7, those of the upper leaves linear, the lateral ones 4-8 mm. long, the terminal one sometimes 15-20 mm. long, those of the lower leaves oval or obovate, 5-8 mm. long, 2-3 mm. wide; racemes lax, including the peduncle 1-2 dm. long; calyx sparingly strigose with black hairs, the tube 1.5 mm. long, the teeth deltoid-subulate, 1 mm. long; corolla white, tinged with greenish hue; banner 5 mm. long; wings slightly longer than the keel; keel-petals 3 mm. long, with roundish tips; pod 10-12 mm. long, oblong, short-stipitate, glabrous, 3 mm. wide; seeds black, oblong-reniform, nearly 3 mm. long, 1.5 mm. wide.
Type locality : Glenwood Springs, Colorado.
Distribution : Western Colorado.

Perennial, Herbs, Stems woody below, or from woody crown or caudex, Plants with rhizomes or suckers, 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 sparsely to densely hairy, Leaves alternate, Leaves petiolate, Stipules conspicuous, Stipules membranous or chartaceous, Stipules persistent, Stipules connate to each other, forming a tuber or sheath, 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, Inflorescence or flowers lax, declined or pendulous, Bracts very small, absent or caducous, Flowers zygomorphic, Calyx 5-lobed, Calyx hairy, Petals separate, Corolla papilionaceous, Petals clawed, Petals white, Petals blue, lavander to purple, or violet, Petals bicolored or with red, purple or yellow streaks or spots, 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 freely dehiscent, Fruit oblong or ellipsoidal, Fruit or valves persistent on stem, Fruit exserted from calyx, Fruit beaked, Fruit glabrous or glabrate, Fruit 3-10 seeded, Seeds cordiform, mit-shaped, notched at one end, Seed surface smooth, Seeds olive, brown, or black.