Astragalus lentiginosus var. platyphyllidius |
Astragalus lentiginosus var. toyabensis |
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broad-leaf freckled milkvetch, broad-leaf milkvetch |
toyabe milkvetch |
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Habit | Plants perennial, (7–)10–30(–35) cm. | Plants perennial, 10–30 cm. |
Stems | usually ascending, rarely prostrate. |
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Leaves | (4–)5–11 cm; leaflets (7–)11–17(or 19), blades usually broadly obovate-cuneate, elliptic, or suborbiculate, rarely rhombic-elliptic, (4–)7–20 mm, apex usually obtuse, retuse, truncate, or apiculate, rarely acute. |
3–13(–16) cm; leaflets (7–)15–25, blades oval-obovate, broadly oblanceolate, or narrowly elliptic-oblanceolate, (2–)6–16(–21)mm, apex obtuse and apiculate, truncate, acute, or subacute. |
Racemes | shortly and loosely (5–)7–15-flowered, flowering from near or proximal to middle nodes, short and compact in fruit; axis little elongating, 1–3.5 cm in fruit. |
7–18-flowered, short and compact in fruit; axis 1–2.5(–5) cm in fruit. |
Peduncles | 1–5 cm. |
1.5–4.5(–6.5) cm. |
Flowers | (12.6–)14–21.4 mm; calyx (8–)8.5–12.5 mm, tube (5–)5.5–8(–9) mm, lobes 2.4–5 mm; corolla usually whitish, rarely purple. |
12.6–17 mm; calyx (6.2–)6.7–10 mm, tube 5–6.5 mm, lobes (1.2–)1.6–3.5(–4) mm; corolla usually pink-purple, rarely whitish. |
Legumes | variable in length, outline, and curvature, pale green or purple-speckled becoming stramineous or brownish, plumply ovoid or narrowly lanceoloid-ellipsoid, (13–)15–40(–48) × 7–14 mm, ± bilocular, strongly or slightly inflated, ± fleshy becoming leathery or stiffly papery, usually glabrous, sometimes minutely strigulose; beak deltoid or lanceolate-acuminate, 5–15 mm, unilocular. |
usually mottled becoming stramineous, narrowly to broadly ovoid-acuminate, ± strongly inflated, 8–20 × 4–11 mm, thinly papery, glabrous or exceptionally puberulent; beak triangular-acuminate, (3–)4–11 mm, unilocular. |
Seeds | (21–)24–32(–38). |
13–20. |
Astragalus lentiginosus var. platyphyllidius |
Astragalus lentiginosus var. toyabensis |
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Phenology | Flowering May–Jul. | Flowering Jun–Aug. |
Habitat | Arid plains, hillsides, and valley floors, on basalt, with sagebrush. | Dry, stony hillsides with sagebrush, open, treeless crests within timber belt, rarely above timber belt, on cool, loamy soils among aspens, on igneous bedrock. |
Elevation | 600–1900(–2100) m. (2000–6200(–6900) ft.) | (1800–)2400–3500 m. ((5900–)7900–11500 ft.) |
Distribution |
CA; CO; ID; NV; OR; UT; WY |
NV |
Discussion | Variety platyphyllidius is dispersed widely from eastern Oregon and northeastern California, across southern Idaho into western Wyoming, northeastern Nevada, and barely into northern Utah and northwestern Colorado. It is apparently common only locally, distinguished by its typically pale flowers and thick-textured fruits (approximate length of two times width or less). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Usually a montane plant of central and west-central Nevada, var. toyabensis sometimes descends into the foothills as low as 1830 m, where it enters the habitat of, and apparently grades into, var. chartaceus, a form that differs typically in its leathery or at least much more stiffly papery fruit (R. C. Barneby 1964). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Cystium platyphyllidium, A. lentiginosus var. cornutus, A. merrillii, C. cornutum, C. merrillii | |
Name authority | (Rydberg) M. Peck: Man. Pl. Oregon, 449. (1941) — (as platyphyllidium) | Barneby: Leafl. W. Bot. 4: 106, plate 3, figs. 1–4. (1945) |
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