Astragalus lentiginosus var. trumbullensis |
Astragalus lentiginosus var. oropedii |
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freckled milkvetch, Mount Trumbull milkvetch |
freckled milkvetch, Kaibab Plateau milkvetch |
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Habit | Plants perennial, 30–45(–65) cm, herbage green or subglabrescent. | Plants perennial, (10–)20–80 cm. |
Stems | decumbent or weakly ascending, flexuous or zigzag in age, glabrous or glabrate. |
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Leaves | 2–9.5(–10.5) cm; leaflets (7–)13–17, blades broadly obovate to oblanceolate or elliptic, 5–15 mm, apex retuse to round or subacute, adaxial surface usually strigose to strigulose, sometimes glabrate or glabrous. |
5–15 cm; leaflets 15–21(–25), blades broadly oblong-elliptic, ovate-oblong, or suborbiculate, 5–20(–25) mm, apex rounded, truncate, or retuse. |
Racemes | loosely 4–15(–17)-flowered; axis elongating, 3–9.5 cm in fruit. |
shortly (8–)10–25-flowered, compact in fruit; axis little elongating, 1.5–4(–5) cm in fruit. |
Peduncles | 4.5–7.5 cm. |
(2–)3–10 cm. |
Flowers | 13–17 mm; calyx 6.3–7.4 mm, tube 4.8–5.5 mm, lobes 1.7–2 mm; corolla pink- or red-purple, sometimes with pale or white wing tips. |
(12.5–)13.2–20 mm; calyx 7.5–10.8 mm, tube (4.5–)5–7.5 mm, lobes (2.5–)3–5 mm; corolla purple or pale pink-purple. |
Legumes | evidently persistent, stramineous or mottled, linear-oblong to oblong or narrowly ellipsoid, not or scarcely inflated, 17–32 × 4–5.5(–7.5) mm, ± bilocular, somewhat fleshy becoming leathery or stiffly papery, strigulose; beak 3–5 mm, unilocular; stipe 0.1–1 mm. |
mottled, obliquely ovoid or semi-ovoid, ± strongly inflated, 13–25(–30) × 6.5–14 mm, ± bilocular, stiffly papery, glabrous; beak 5–8 mm, unilocular. |
Seeds | 14–28. |
20–33. |
Astragalus lentiginosus var. trumbullensis |
Astragalus lentiginosus var. oropedii |
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Phenology | Flowering Apr (Sep). | Flowering Jun–Sep. |
Habitat | Sandstone outcrops and gravel, with Agave, Ephedra, Mortonia, Purshia, and other warm-desert shrubs. | Openings in ponderosa pine forests. |
Elevation | 900–1800 m. (3000–5900 ft.) | 2100–2500 m. (6900–8200 ft.) |
Distribution |
AZ |
AZ |
Discussion | Variety trumbullensis is restricted to Mohave County. It is closely related to vars. mokiacensis and palans, weakly differentiated by a series of features that intergrade insensibly but taken in combination are more or less diagnostic (as is true for most members of the lentiginosus complex). J. A. Alexander (2005) provided statistical evidence that this variety is indistinguishable from var. mokiacensis (as Astragalus mokiacensis), and he considered the two synonymous. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Variety oropedii is locally common but apparently confined to the Kaibab Plateau, especially the North Rim and upper levels of the northern wall of the Grand Canyon in Coconino County. Specimens with thin-textured, subdiaphanous fruits that occur within or near known localities of var. oropedii have been tentatively placed with var. vitreus. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Name authority | S. L. Welsh & N. D. Atwood: Rhodora 103: 81, fig. 3. (2001) | Barneby: Leafl. W. Bot. 4: 135. (1945) |
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