Astragalus lentiginosus var. lentiginosus |
Astragalus lentiginosus var. wilsonii |
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freckled milk-vetch, specklepod milk-vetch |
wilson's milkvetch |
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Habit | Plants perennial, 10–30(–50) cm, sparsely strigulose. | Plants perennial, 20–50 cm, herbage green or subglabrescent. |
Leaves | 3–10 cm; leaflets (5–)9–17(or 19), blades broadly obovate, obovate-cuneate, or oblong-elliptic to suborbiculate or oblanceolate, (3–)5–15 mm, apex retuse or obtuse. |
(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 | 8–18(–22)-flowered; axis 0.5–3(–3.5) cm in fruit. |
shortly and loosely (7–)10–17(–22)-flowered; axis not elongating, 1.5–4(–13) cm in fruit. |
Peduncles | 1–3.5 cm. |
2.5–7(–8) cm. |
Flowers | 7.4–11 mm; calyx 4.1–6.4 mm, tube 2.8–4.2 mm, lobes 1–2.2 mm; corolla whitish or yellowish, sometimes faintly lilac. |
(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 | green, usually mottled, becoming stramineous or brownish, obliquely ovoid-acuminate to lanceoloid-acuminate, strongly to scarcely inflated, 10–23 × (3–)4.5–10 mm, semibilocular, stiffly papery, opaque or nearly so, usually thinly strigulose, rarely puberulent; beak 4–9 mm, unilocular. |
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 | (15 or)16–21. |
(29–)32–41. |
2n | = 22. |
= 22. |
Astragalus lentiginosus var. lentiginosus |
Astragalus lentiginosus var. wilsonii |
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Phenology | Flowering May–early Jul. | Flowering Feb–Jun. |
Habitat | Often on volcanic soils, on basalt, with sagebrush and bunchgrass, in ponderosa pine and western juniper communities. | Ponderosa pine forests, oak and juniper communities on volcanic substrates. |
Elevation | 200–1500 m. (700–4900 ft.) | 900–2200 m. (3000–7200 ft.) |
Distribution |
CA; ID; NV; OR; WA; BC |
AZ |
Discussion | Variety lentiginosus is widespread in the northern part of its range and is partially sympatric with vars. platyphyllidius and salinus in the southern part of its range. It is transitional to both. (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. lentiginosus var. carinatus | A. wilsonii |
Name authority | unknown | (Greene) Barneby: Leafl. W. Bot. 4: 139. (1945) |
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