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Mogollon woolly locoweed, woolly locoweed

Habit Plants acaulescent, usually dwarf. Herbs perennial, tuft- or clump-forming, acaulescent or caulescent; caudex superficial.
Stems

reduced to thick crowns, closely invested with stipules.

obsolete, single, or few to several.

Leaves

(4–)6–16 cm;

stipules 5–12 mm;

leaflets (9–)13–23, blades broadly elliptic to suborbiculate, 3–13 mm.

odd-pinnate, petiolate;

leaflets (9 or)11–35.

Racemes

densely 12–32-flowered;

axis 1.5–6 cm in fruit.

initially densely flowered, flowers spreading or ascending.

Peduncles

scapiform, 4–10 cm.

Flowers

calyx 10–15.3 mm, tube 6.6–8.5 × 3.2–5 mm, lobes 3.3–6.8 mm;

corolla pink-purple;

banner 16–21.5 mm;

keel 12.5–14.5 mm.

Corollas

purple, pinkish, pink-purple, yellowish suffused with lilac, or ochroleucous, banner recurved through 30°, keel apex round or triangular.

Calyx

tubes cylindric or deeply campanulate.

Legumes

± straight to gently incurved, narrowly ovoid or lunately ellipsoid, 9–13 × 4.5–6 mm, densely villous-tomentose, hairs to 1.6–2.6 mm;

beak bilocular.

deciduous, sessile, spreading or ascending, (usually humistrate), obliquely ovoid, lanceoloid-ellipsoid, or linear-oblong, straight or incurved, terete to obcompressed, bilocular.

Seeds

19–28.

12–38[–41].

Pubescence

copious and commonly villous-tomentose, with shorter, usually curly, and longer spirally twisted hairs, usually turning rusty brown on drying.

Hairs

basifixed.

Stipules

distinct.

Astragalus mollissimus var. mogollonicus

Astragalus sect. Mollissimi

Phenology Flowering Apr–Jul.
Habitat Stony flats and hilltops, on pebbly, volcanic soils of open ponderosa pine forests, on limestone substrates, rocky knolls in pinyon-juniper belt.
Elevation 1800–2300 m. (5900–7500 ft.)
Distribution
from FNA
AZ; NM
[BONAP county map]
c United States; sw United States; n Mexico
Discussion

D. Isely (1998) viewed var. mogollonicus as a reduced phase of var. bigelovii, but var. mogollonicus is distinguished by its acaulescent growth habit and scapiform peduncles. It occurs from the Kaibab Plateau south of the Grand Canyon in Arizona to the southeast along the Mogollon Escarpment to western New Mexico.

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

Species 3 (2 in the flora).

Section Mollissimi consists of three monospecific subsections: subsect. Mollissimi (A. Gray Barneby (Astragalus mollissimus); subsect. Nutriosenses S. L. Welsh (A. nutriosensis); and subsect. Orthanthi Barneby (A. helleri Fenzl). The last occurs only in Mexico.

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

Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Mollissimi > Astragalus mollissimus Fabaceae > subfam. Faboideae > Astragalus
Sibling taxa
A. mollissimus var. bigelovii, A. mollissimus var. coryi, A. mollissimus var. earlei, A. mollissimus var. marcidus, A. mollissimus var. matthewsii, A. mollissimus var. mollissimus, A. mollissimus var. thompsoniae
Subordinate taxa
Synonyms A. mogollonicus, A. bigelovii var. mogollonicus
Name authority (Greene) Barneby: Mem. New York Bot. Gard. 13: 745. (1964) A. Gray: Proc. Amer. Acad. Arts 6: 195. (1864)
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