Astragalus lentiginosus var. yuccanus |
Astragalus lentiginosus var. multiracemosus |
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yucca freckled milkvetch, yucca milkvetch |
lamoille canyon milkvetch |
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Habit | Plants winter-annual or short-lived perennial, clump-forming, 15–60(–100) cm. | Plants perennial, 25–48 cm. |
Stems | erect and ascending. |
prostrate, radiating from root-crown. |
Leaves | (5–)7–16 cm; leaflets 13–21(–25), blades broadly elliptic, oval, rhombic-obovate, or obovate, (4–)6–21 mm, apex retuse or emarginate. |
6.5–12 cm; leaflets 15 or 17, blades lanceolate to oblong-elliptic, 7–18 mm, apex truncate or round. |
Racemes | loosely (12–)15–32-flowered, lax and open in fruit; axis early elongating, (4.5–)6–14 cm in fruit. |
12–14-flowered, floriferous from all but proximalmost nodes, short and compact in fruit; axis 4–4.5 cm in fruit. |
Peduncles | (3–)5–10 cm. |
1.3–2 cm. |
Flowers | 11–15.6 mm; calyx 6–7.5 mm, tube 4.4–5.7 mm, lobes (1.3–)1.5–2.4 mm; corolla white or ochroleucous, concolorous, sometimes fading pale bluish, petals poorly graduated, banner slightly longer than wings, wings and keel nearly equal length. |
12–15 mm; calyx 7–7.5 mm, tube 4–4.5 mm, lobes 3–3.2 mm; corolla whitish or faintly lavender. |
Legumes | stramineous, plumply ovoid-acuminate or subglobose, strongly inflated, 15–25(–32) × 10–18 mm, bilocular, papery-membranous, subtranslucent, usually glabrous, rarely minutely strigulose; beak 3–7 mm, unilocular. |
purple-mottled becoming stramineous, broadly ovoid-acuminate, strongly inflated, 8–12 × 5–6 mm, opaque-papery, glabrous; beak 3–5 mm, unilocular. |
Seeds | 17–26. |
not determined. |
2n | = 22. |
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Astragalus lentiginosus var. yuccanus |
Astragalus lentiginosus var. multiracemosus |
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Phenology | Flowering Feb–May. | Flowering Jul–Sep. |
Habitat | Open sandy plains, sandy or rocky washes, gulches in foothills of desert mountains, with Larrea and in yucca-grasslands. | Moist seeps. |
Elevation | 500–1100 m. (1600–3600 ft.) | 2500–2600 m. (8200–8500 ft.) |
Distribution |
AZ; NV |
NV |
Discussion | Variety yuccanus occurs in west-central Arizona, barely entering Nevada in the southern tip of Clark County. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Variety multiracemosus is known only from Lamoille Canyon in the Ruby Mountains in Elko County. The proliferous habit of producing numerous racemes along prostrate stems is shared with disjunct vars. floribundus, ineptus, piscinensis, and sesquimetralis. The nearest relationship is most likely with var. salinus, which sometimes produces racemes from middle as well as distal nodes, producing new flowers distally while proximal racemes are in fruit. Flower size is similar to that of var. salinus; fruit is similar to that of var. scorpionis. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Name authority | M. E. Jones: Contr. W. Bot. 8: 3. (1898) | S. L. Welsh & N. D. Atwood in S. L. Welsh: N. Amer. Sp. Astragalus, 294, fig. 285c. (2007) |
Web links |