Flora of North America species comparison

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Astragalus humistratus var. tenerrimus
Photo is of parent taxon

delicate milkvetch, groundcover milkvetch
Habit Plants forming loose mats, to 8+ dm wide, strigulose, hairs ± straight, sometimes shorter ones crispate or sinuous, herbage greenish cinereous or silvery.
Stems

10–30 cm, sometimes 1–3 cm underground.
Leaves

1–3(–4) cm;

leaflets (9 or)11–15, blades 2–6.5 mm, surfaces pubescent or glabrescent adaxially.
Racemes

3–6(–8)-flowered;

axis 0.5–2 cm in fruit.
Peduncles

1–3(–4) cm.
Flowers

calyx 3.2–4.7 mm, tube 2.1–2.7 mm, lobes subulate, 1–1.2 mm;

corolla whitish, veined or suffused with lilac-purple;

banner 5.9–7.2 × 5.2–6.6 mm.
Legumes

lunately semi-ovoid-ellipsoid, 6–9 × 3–4.5 mm, loosely strigulose.
Seeds

9–14.
Stipules

1.5–4.5(–5.5) mm.

Astragalus humistratus var. tenerrimus
Phenology Flowering Jul–Sep.
Habitat Meadows, ponderosa pine, white fir, and spruce forests, margins of aspen stands.
Elevation 2400–2800 m. (7900–9200 ft.)
Distribution
from FNA
AZ
[BONAP county map]
Discussion

Variety tenerrimus, a diminutive Kaibab Plateau endemic, may deserve specific status as proposed by P. A. Rydberg (1929) in the segregate genus Batidophaca Rydberg. R. C. Barneby (1964) considered it closely allied to var. humivagans.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Humistrati > Astragalus humistratus
Sibling taxa
A. humistratus var. crispulus, A. humistratus var. hosackiae, A. humistratus var. humistratus, A. humistratus var. humivagans, A. humistratus var. sonorae
Name authority M. E. Jones: Proc. Calif. Acad. Sci., ser. 2, 5: 649. (1895)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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