Astragalus tephrodes var. brachylobus |
Astragalus tephrodes var. tephrodes |
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ashen milk vetch, prescott milkvetch |
ashen milkvetch |
|
Stems | 0–8 cm. |
1–12(–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. |
4.5–10(–19) cm; leaflets (11–)17–27(–31), blades mostly conduplicate, loosely folded, obovate-cuneate or oblanceolate, 3–16 mm, apex obtuse, emarginate, or subacute. |
Racemes | 10–25(–35)-flowered; axis (1.5–)2–8(–11) cm in fruit. |
(9–)11–20-flowered; axis 2–6(–8.5) cm in fruit. |
Peduncles | (4–)5–15(–21) cm. |
4–14(–17) 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. |
11.8–17.5 mm; calyx (5–)6.4–8.5(–9.2) mm, tube (3.5–)4.5–6.8(–8) mm, lobes 1.2–2.2 mm; corolla banner 11.8–17.5 mm; keel 10.2–14.5 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. |
obliquely ovoid-acuminate, 13–20 × 5–8 mm, beak 3–6 mm, thinly leathery, hardly rigid, not rugulose, densely pilosulous. |
Seeds | 24–35. |
26–31. |
Stipules | 2.5–11 mm, surfaces villosulous, sparsely strigulose, or glabrate abaxially. |
2–7 mm. |
2n | = 22. |
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Astragalus tephrodes var. brachylobus |
Astragalus tephrodes var. tephrodes |
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Phenology | Flowering Apr–Jun. | Flowering Apr–Jun. |
Habitat | Arid grasslands, oak-chaparral, in pinyon-juniper, juniper, or ponderosa pine forests, on volcanic, granitic, or sedimentary bedrock (including limestone). | Oak brush, among junipers, in yucca-grasslands, edges of ponderosa pine forests, on granitic or volcanic bedrock. |
Elevation | 1000–2000 m. (3300–6600 ft.) | 1400–2200 m. (4600–7200 ft.) |
Distribution |
AZ; CA; NM; NV |
AZ; NM; Mexico (Sonora) |
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.) |
Variety tephrodes is locally plentiful in the foothills of the Mogollon and Pinos Altos mountains in southwestern New Mexico, eastward to the Organ Mountains and southward into Mexico. (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 | |
Name authority | (A. Gray) Barneby: Amer. Midl. Naturalist 37: 466. (1947) | unknown |
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