Astragalus lentiginosus var. yuccanus |
Astragalus lentiginosus var. kernensis |
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yucca freckled milkvetch, yucca milkvetch |
Kern milkvetch, Kern Plateau milk vetch, Kern River milkvetch |
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Habit | Plants winter-annual or short-lived perennial, clump-forming, 15–60(–100) cm. | Plants perennial, 2.5–12 cm. |
Stems | erect and ascending. |
prostrate or decumbent. |
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. |
1–5 cm; leaflets (7–)11–19, mostly conduplicate, blades elliptic-oblanceolate, oval, or obovate, 1.5–7 mm, apex obtuse or emarginate. |
Racemes | loosely (12–)15–32-flowered, lax and open in fruit; axis early elongating, (4.5–)6–14 cm in fruit. |
shortly and loosely (2 or)3–9-flowered, short and compact in fruit; axis 0.3–1.5 cm in fruit. |
Peduncles | (3–)5–10 cm. |
0.6–2.5 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. |
9.3–11.3 mm; calyx 4.1–5.3 mm, tube 3.5–4.6 mm, lobes 0.6–1.2 mm; corolla whitish or suffused purplish. |
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. |
in loose or compact, humistrate clusters, pale green or stramineous, purple-mottled, becoming brownish, globose or very broadly and plumply ovoid or obovoid, bladdery-inflated, 6–13 × 6–10 mm, papery, subtranslucent, sparsely and loosely strigulose; beak linear- or subulate-tubular, cusplike, bilocular. |
Seeds | 17–26. |
(7–)10–18. |
2n | = 22. |
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Astragalus lentiginosus var. yuccanus |
Astragalus lentiginosus var. kernensis |
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Phenology | Flowering Feb–May. | Flowering Jun–Jul. |
Habitat | Open sandy plains, sandy or rocky washes, gulches in foothills of desert mountains, with Larrea and in yucca-grasslands. | Dry, gravelly or sandy slopes and flats, with sagebrush, in lodgepole pine forests on granite, with bristlecone pine, on limestone. |
Elevation | 500–1100 m. (1600–3600 ft.) | (1900–)2300–3100 m. ((6200–)7500–10200 ft.) |
Distribution |
AZ; NV |
CA; 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.) |
The relatively small fruit size of var. kernensis coupled with a narrow, tubular beak resembling a persistent style are the main features of this delicate, montane plant. It is locally plentiful in two widely separate and restricted areas: the Kern Plateau just west of the Sierra Nevada crest in Tulare County, California, and about the summit of Charleston Peak in Clark County, Nevada. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. kernensis | |
Name authority | M. E. Jones: Contr. W. Bot. 8: 3. (1898) | (Jepson) Barneby: Leafl. W. Bot. 4: 102. (1945) |
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