Astragalus cremnophylax Barneby
Family: Fabaceae
sentry milkvetch,  more...
Astragalus cremnophylax image
Daniela Roth  
Duration: Perennial Nativity: Native Lifeform: Forb/Herb General: Perennial, plants diminutive, cushion-like, essentially acaulescent; herbage silvery strigose with dolabriform hairs; caudex gnarled, closely branched, covered with persistent but withered leaf bases and stipules. Leaves: Alternate, odd-pinnate (sometimes sub-palmate), 0.3-3 cm long; leaflets 5-9, crowded, elliptic, obovate, or orbicular, 1-2.5 mm long, minutely strigose, margins entire, apex obtuse; stipules distinct, clasping; petiole short. Flowers: Inflorescence an axillary raceme, 2-10 flowered, usually shorter than the leaves; peduncle 0.5-3 (5) cm long; calyx 6-10.5 mm long, minutely strigose, the teeth 1.3- 2.5 mm long; corolla whitish or dingy white, the keel tip spotted or blotched, or all suffused with pale purple; banner 11-18.5 mm long, the wings slightly shorter; flowers May-July. Fruits: Legume, ascending, mostly lying on the ground, obliquely ovoid, 3-4.5 mm long, 2-3 mm in diameter, pale green or purple-dotted, densely strigose; legumes sessile. Ecology: Crevices and fissures in limestone; 2100 m (7000 ft); Coconino County (endemic to the South Rim of the Grand Canyon); southwestern U.S. Notes: Ours is var. cremnopylax, and is a federally listed endangered species. Astragalus gilensis (Gila milkvetch) is distinguished by its tufted to mat-forming habit, acaulescent or nearly so; herbage is silvery-strigose with dolabriform hairs; leaves are 2.5-9 cm long, with mostly 11-21 leaflets, these elliptic, oblong-elliptic, or oblanceolate, 3-12 mm long; racemes are densely 7-26 flowered, forming a sub-capitate cluster, peduncles 3.5- 15 cm long; corolla is pale-pink to pink-purple with white wing tips, the banner 6.2-10.4 mm long; legumes are ascending to spreading, ovoid to oblong-ellipsoid, 4.5- 7.5 mm long, reddish tinged and strigose. It typically occurs in sandy to gravelly soils, often under pines at 1800-2600 m (6000-8500 ft). Editor: Springer et al. 2008
Astragalus cremnophylax image
Daniela Roth  
Astragalus cremnophylax image
Daniela Roth  
Astragalus cremnophylax image
Daniela Roth  
The National Science Foundation
This project made possible by National Science Foundation Award 1410069