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Matthews woolly locoweed, woolly locoweed

Habit Plants acaulescent or subacaulescent.
Stems

to 1.5 cm, obscured by imbricate stipules.

Leaves

(3–)5–12 cm;

stipules (3–)4–8 mm;

leaflets 11–23, blades obovate, 3–12 mm.

Racemes

(5–)7–12-flowered;

axis (0.5–)1–4.5 cm in fruit, not or scarcely surpassing foliage.

Peduncles

scapiform, (1.5–)2.5–8 cm.

Flowers

calyx 10–13 mm, tube 7–8.6 × 3.4–4.7 mm, lobes 2.4–5.2 mm;

corolla pale purple;

banner 18.5–22.5 mm;

keel 14.2–18 mm.

Legumes

gently or abruptly incurved distally, broadly ovoid, turgid, 12–18 × 7–13 mm, widest near obtuse or truncate base, densely villous-tomentose;

beak bilocular.

Seeds

24–31.

Astragalus mollissimus var. matthewsii

Phenology Flowering Apr–Jun.
Habitat Open slopes and hilltops, in ponderosa pine forests, along canyons to juniper-pinyon belt, on light, sandy or gravelly, sedimentary, granitic, or volcanic soils.
Elevation 1900–2600 m. (6200–8500 ft.)
Distribution
from FNA
AZ; NM
[BONAP county map]
Discussion

Variety matthewsii is scattered and uncommon in Apache County in eastern Arizona and from Santa Fe to McKinley counties in the mountains of north-central and northwestern New Mexico.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Mollissimi > Astragalus mollissimus
Sibling taxa
A. mollissimus var. bigelovii, A. mollissimus var. coryi, A. mollissimus var. earlei, A. mollissimus var. marcidus, A. mollissimus var. mogollonicus, A. mollissimus var. mollissimus, A. mollissimus var. thompsoniae
Synonyms A. matthewsii, A. bigelovii var. matthewsii
Name authority (S. Watson) Barneby: Mem. New York Bot. Gard. 13: 746. (1964)
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