Astragalus atwoodii
Great Basin Naturalist 37: 103, fig. 1. 1977.
Plants 19–57 cm, gray-strigulose; from shallow, subterranean caudex. Stems erect, 2–6 cm underground, gray-strigulose. Leaves 0.6–9 cm; stipules distinct throughout, or amplexicaul and connate-sheathing at proximal nodes, 1.5–4 mm; leaflets (7 or)9–17, blades linear to narrowly oblong, 1.5–12.5 mm, apex obtuse to rounded, surfaces strigose; terminal leaflet often continuous with rachis. Peduncles 4–7.5 cm. Racemes 2–15-flowered, flowers ascending-spreading; axis 2–11 cm in fruit; bracts 1–2 mm; bracteoles 0 or 1. Pedicels 1–2.5 mm. Flowers 8–11 mm; calyx campanulate, 5–6.5 mm, strigose, tube 3.5–4 mm, lobes subulate, 1.1–2.6 mm; corolla ochroleucous, suffused with purple, faintly lilac-tinged; banner recurved through 90°; keel 7.5–9.7 mm, apex slightly beaked. Legumes spreading or declined, stramineous, straight to slightly curved, oblong-ellipsoid, terete or dorsiventrally compressed, slightly inflated, 21–34 × 2.8–5 mm, papery, strigose; stipe to 1 mm. Seeds 18–22.
Phenology: Flowering Apr–Jun.
Habitat: Pinyon-juniper, cliffrose, sagebrush communities.
Elevation: 1800–2100 m.
Discussion
Astragalus atwoodii, known from the Kaibab Plateau and House Rock Valley in Coconino County, is similar to, but geographically disjunct from, A. pinonis. It grows in shrubs, displaying leaves and flowers above the shrubs.
Selected References
None.