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Photo is of parent taxon

Matthews woolly locoweed, woolly locoweed

Photo is of parent taxon

woolly locoweed

Habit Plants acaulescent or subacaulescent. Plants usually shortly caulescent, sometimes subacaulescent, to 45 cm.
Stems

to 1.5 cm, obscured by imbricate stipules.

1.5–18 cm, internodes to 4 cm or obscured by imbricate stipules.

Leaves

(3–)5–12 cm;

stipules (3–)4–8 mm;

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

(7–)10–20(–25) cm;

stipules (5–)7–17 mm;

leaflets 15–27(–33), blades usually oval, ovate, or obovate, sometimes rhombic-elliptic, 5–22 mm.

Racemes

(5–)7–12-flowered;

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

(10–)15–40-flowered;

axis elongating, (2–)4–17 cm in fruit.

Peduncles

scapiform, (1.5–)2.5–8 cm.

6–23 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.

calyx (8.8–)10.5–14 mm, tube 6.8–9.5 × 3.4–4.5 mm, lobes (2–)3–5 mm;

corolla pinkish, pink-purple, pale yellow, or yellowish suffused with dull lavender;

banner (16–)17.5–21.5 mm;

keel 14–18 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.

shallowly crescentic or abruptly incurved near middle through ± 90°, contracted distally, narrowly oblong-ellipsoid to lanceoloid-ellipsoid, 14–24 × 4–7 mm, mostly glabrous and apex usually puberulent or hispidulous, rarely puberulent, sometimes shortly villosulous throughout;

beak unilocular.

Seeds

24–31.

26–37.

2n

= 22.

Astragalus mollissimus var. matthewsii

Astragalus mollissimus var. mollissimus

Phenology Flowering Apr–Jun. Flowering Apr–Jul.
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. Prairies, plains, valley floors, stony mesas, and fallow fields on alluvial loams, loess, on outcrops of shale, limestone, or sandstone, most abundant where vegetation is low and sparse.
Elevation 1900–2600 m. (6200–8500 ft.) 500–1900 m. (1600–6200 ft.)
Distribution
from FNA
AZ; NM
[BONAP county map]
from FNA
CO; KS; NE; NM; OK; SD; TX; WY
[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.)

Flowers of var. mollissimus are normally dull purplish, but in some New Mexico populations they are a pure pale yellow, the basis of forma flavus McGregor.

(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 > 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
A. mollissimus var. bigelovii, A. mollissimus var. coryi, A. mollissimus var. earlei, A. mollissimus var. marcidus, A. mollissimus var. matthewsii, A. mollissimus var. mogollonicus, A. mollissimus var. thompsoniae
Synonyms A. matthewsii, A. bigelovii var. matthewsii
Name authority (S. Watson) Barneby: Mem. New York Bot. Gard. 13: 746. (1964) unknown
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