Astragalus lentiginosus var. pohlii |
Astragalus lentiginosus var. wilsonii |
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pohil's milkvetch, pohl's milkvetch |
wilson's milkvetch |
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Habit | Plants perennial, 7–20 cm. | Plants perennial, 20–50 cm, herbage green or subglabrescent. |
Leaves | (4–)5–9 cm; leaflets 11–17, blades broadly obovate-cuneate or suborbiculate, 4–11 mm, apex obtuse or retuse to emarginate. |
(3.5–)6–16 cm; leaflets (11–)17–25, blades ovate, broadly elliptic, or oblong-obovate, (4–)6–20(–25) mm, apex obtuse to emarginate. |
Racemes | shortly and loosely 3–9-flowered, short and compact in fruit; axis 1–3.5 cm in fruit. |
shortly and loosely (7–)10–17(–22)-flowered; axis not elongating, 1.5–4(–13) cm in fruit. |
Peduncles | 1–4 cm. |
2.5–7(–8) cm. |
Flowers | 20–23 mm; calyx 8.5–10.5 mm, tube 8–10 mm, lobes 2.4–3 mm; corolla whitish tinged with violet. |
(14.2–)15–20 mm; calyx (7–)7.7–9.4 mm, tube (5.5–)5.7–7.7 mm, lobes 1.5–3 mm; corolla white or suffused or tipped pink or pink-purple. |
Legumes | pale green or purple-speckled becoming stramineous or brownish, plumply ovoid, strongly inflated, 23–33 × 10–15 mm, ± bilocular, leathery or stiffly papery, minutely strigulose; beak 5–15 mm, unilocular; stipe 0.5–1.5 mm. |
green or mottled becoming stramineous or brownish, narrowly lanceoloid-acuminate, scarcely to moderately inflated, (15–)20–35 × 3.8–7 mm, ± bilocular, stiffly papery, glabrous or puberulent; beak 5–10 mm, unilocular. |
Seeds | 24–32. |
(29–)32–41. |
2n | = 22. |
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Astragalus lentiginosus var. pohlii |
Astragalus lentiginosus var. wilsonii |
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Phenology | Flowering May–Jun. | Flowering Feb–Jun. |
Habitat | Greasewood, shadscale, horsebrush, and big sagebrush communities, vegetated sand dunes. | Ponderosa pine forests, oak and juniper communities on volcanic substrates. |
Elevation | 1300–1700 m. (4300–5600 ft.) | 900–2200 m. (3000–7200 ft.) |
Distribution |
UT |
AZ |
Discussion | Variety pohlii is restricted to the Rush and Skull valleys in Tooele County. The shortly stipitate fruit is unusual among varieties of Astragalus lentiginosus. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Variety wilsonii occurs on the Coconino Plateau near Flagstaff and near the head of the Verde River in southwestern Coconino, northwestern Gila, and eastern Yavapai counties. Some plants share features with the closely adjacent, but still disjunct, var. maricopae, as discussed by S. L. Welsh (2007). M. E. Jones (1923) placed these in var. palans, a taxon well to the north. Provisionally, these unusual plants form a portion of what has traditionally been understood as var. wilsonii. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. wilsonii | |
Name authority | S. L. Welsh & Barneby: Iselya 2: 1. (1981) | (Greene) Barneby: Leafl. W. Bot. 4: 139. (1945) |
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