Astragalus utahensis, Utah milkvetch



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Intermountain Flora
Tufted, subacaulescent or more commonly diffusely caulescent, matted, perennial herbs, densely pannosetomentose throughout with fine, entangled, curly hairs, the cottony, not at all lustrous vesture usually concealing the surface of stem and leaflets; stems almost 0 up to 1.5 (2) dm tall; stipules submembranous, ovate-triangular to lance-caudate, 3-10 mm long, semiamplexicaul, free; leaves (1.5) 3-12 cm long, the petiole deciduous or weakly persistent; leaflets (5) 9-19, obovate, elliptic-obovate, or suborbicular and obtuse-emarginate, or rarely rhombic-oviod and acute, (2) 4-15 mm long; peduncles (1) 3-10 cm long, incurved-ascending at anthesis, procumbent in fruit; recemes shortly or subumbellately 2-8 flowered, the flowers ascending, the axis becoming 5-25 mm long; calyx 13-17 mm long, white- or fuscous-villous-tomentulose, the broadly cylindric or tumescent and then oblong-ellipsoid tube (8.5) 9-13 mm long, the lance-subulate teeth 2-4.5 mm long; petals bright pink-purple, the gently recurved banner (21) 23-31 mm long, the wings ± 2-3 mm shorter, the obtuse keel (16) 17-22 mm long; ovary densely pilosulous; ovules 22-31; pod ascending, humistrate, sessile on and readily disjointing from a cryptic stipelike projection of the receptacle 1-2.5 m long, the body shorn of hair lance-ellipsoid or narrowly oviod-acuminate, 17-30 (35) x 5-7.5 mm, rounded at base, tapering distally into a short, laterally compressed beak, otherwise obcompressed, shallowly sulcate along both ventral and dorsal face or the latter low-convex, the thinly fleshy valves becoming stiffly chartaceous, their shape and surface concealed in a dense, shaggy-villouss coat of lustrous, silky, cream-colored hairs 4-8 mm long; dehiscence through the narrowly gaping beak, after falling; 2 n = 22.

Cronquist, A., Holmgren, A.H., Holmgren, N.H., Reveal, J.L., and Holmgren, P.K. (1989) "Intermountain Flora" pg. 132, vol. 3 part B, The New York Botanical Garden New York.