Astragalus tephrodes var. brachylobus |
Astragalus tephrodes var. chloridae |
|
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ashen milk vetch, prescott milkvetch |
ashen milkvetch, chloride milkvetch |
|
Stems | 0–8 cm. |
2–15 cm. |
Leaves | 4–16 cm; leaflets 11–27(–31), blades mostly flat, usually obovate-cuneate, oblanceolate, or rhombic-elliptic, rarely suborbiculate, (3–)4–17 mm, apex obtuse, acute, or emarginate. |
10–24 cm; leaflets 19–25, blades flat, rhombic, rhombic-ovate, obovate, or oblanceolate, 6–26 mm, apex usually acute, sometimes obtuse. |
Racemes | 10–25(–35)-flowered; axis (1.5–)2–8(–11) cm in fruit. |
13–24-flowered; axis (4–)7–20 cm in fruit. |
Peduncles | (4–)5–15(–21) cm. |
13–40 cm. |
Flowers | (14–)18–24 mm; calyx 8.8–12.7(–14) mm, pilosulous to loosely strigulose, sometimes villous, tube 7.1–10 mm, lobes 1.7–2.8 mm; corolla banner (14–)18–24 mm; keel 14.7–20.1 mm. |
16.8–20.4 mm; calyx 11.5–14 mm, pilosulous or loosely strigulose, tube 8.3–10.2 mm, lobes 2.1–3.8 mm; corolla banner 16.8–20.4 mm; keel 15.2–18.2 mm. |
Legumes | oblong-ellipsoid to lanceoloid-ellipsoid or, sometimes, ovoid-acuminate, 17–30 × 6–10 mm, somewhat fleshy becoming stiffly leathery or subligneous, usually strigulose or pilosulous, sometimes glabrous. |
lanceolate- or oblong-ellipsoid, 22–34 × 6–10(–12) mm, beak 3–6 mm, stiffly leathery or subligneous, angles ± rugulose, strigulose-pilosulous. |
Seeds | 24–35. |
28–36. |
Stipules | 2.5–11 mm, surfaces villosulous, sparsely strigulose, or glabrate abaxially. |
2–15 mm, surfaces sparsely strigulose or glabrate abaxially. |
2n | = 22. |
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Astragalus tephrodes var. brachylobus |
Astragalus tephrodes var. chloridae |
|
Phenology | Flowering Apr–Jun. | Flowering Mar–May. |
Habitat | Arid grasslands, oak-chaparral, in pinyon-juniper, juniper, or ponderosa pine forests, on volcanic, granitic, or sedimentary bedrock (including limestone). | Larrea and juniper communities. |
Elevation | 1000–2000 m. (3300–6600 ft.) | 900–1400 m. (3000–4600 ft.) |
Distribution |
AZ; CA; NM; NV |
AZ; NV |
Discussion | The range of var. brachylobus extends from the crest of the Mogollon Escarpment northward to the slopes of the Kaibab Plateau, westward to the Colorado River near Needles, California, and southeastward around the edge of the Gila Basin to west-central New Mexico. The pubescent phases of var. brachylobus were aggregated into four groups, three somewhat geographically restricted (R. C. Barneby 1964). Variety brachylobus is difficult to distinguish from var. tephrodes in west-central New Mexico. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
As strictly perceived, var. chloridae is restricted to the Cerbat Mountains, Mohave County, Arizona, and the Newberry Mountains, Clark County, Nevada. D. Isely (1998) allowed a somewhat broader range in Mohave County. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. shortianus var. brachylobus | A. remulcus var. chloridae |
Name authority | (A. Gray) Barneby: Amer. Midl. Naturalist 37: 466. (1947) | (M. E. Jones) Barneby: Mem. New York Bot. Gard. 13: 642. (1964) |
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