Astragalus lentiginosus var. sesquimetralis |
Astragalus lentiginosus var. toyabensis |
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soda springs milkvetch, Sodaville milk vetch |
toyabe milkvetch |
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Habit | Plants perennial, to 70–80 cm. | Plants perennial, 10–30 cm. |
Stems | prostrate. |
usually ascending, rarely prostrate. |
Leaves | 2–5 cm; leaflets 9–15(or 17), blades oblanceolate, 6–18 mm, terminal leaflet 7–15 mm, apex obtuse or subacute. |
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 6–12-flowered, short and compact in fruit; axis 1–2 cm in fruit. |
7–18-flowered, short and compact in fruit; axis 1–2.5(–5) cm in fruit. |
Peduncles | 1.5–4 cm. |
1.5–4.5(–6.5) cm. |
Flowers | 14–14.5 mm; calyx 7–8 mm, tube 4.8–5.5 mm, lobes 2.2–2.5 mm; corolla 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 | mottled, ovoid or broadly lanceoloid, moderately inflated, 16–26 × 9–12 mm, semibilocular, stiffly papery, strigulose; beak incurved, 4–8 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 | 12–20. |
13–20. |
Astragalus lentiginosus var. sesquimetralis |
Astragalus lentiginosus var. toyabensis |
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Phenology | Flowering May–Jun. | Flowering Jun–Aug. |
Habitat | Saline, seasonally moist clay flats, around seeps and springs. | 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 | 900–1400 m. (3000–4600 ft.) | (1800–)2400–3500 m. ((5900–)7900–11500 ft.) |
Distribution |
CA; NV |
NV |
Discussion | The branches of var. sesquimetralis radiate, forming large, round plants that hug the ground. This habit, coupled with a long season of available water, is evidently conducive to long-continuing flowering and fruiting but is not necessarily an indication of a near relationship to other taxa that are similar (see discussion under 285c. var. multiracemosus). The variety is restricted to southern Mineral County, Nevada, and northern Inyo County, California. (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 sesquimetrale | |
Name authority | (Rydberg) Barneby: Leafl. W. Bot. 4: 116. (1945) | Barneby: Leafl. W. Bot. 4: 106, plate 3, figs. 1–4. (1945) |
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