Astragalus lentiginosus var. trumbullensis |
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freckled milkvetch, Mount Trumbull milkvetch |
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Habit | Plants perennial, 30–45(–65) cm, herbage green or subglabrescent. |
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. |
Racemes | loosely 4–15(–17)-flowered; axis elongating, 3–9.5 cm in fruit. |
Peduncles | 4.5–7.5 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. |
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. |
Seeds | 14–28. |
Astragalus lentiginosus var. trumbullensis |
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Phenology | Flowering Apr (Sep). |
Habitat | Sandstone outcrops and gravel, with Agave, Ephedra, Mortonia, Purshia, and other warm-desert shrubs. |
Elevation | 900–1800 m. (3000–5900 ft.) |
Distribution |
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.) |
Source | FNA vol. 11. |
Parent taxa | |
Sibling taxa | |
Name authority | S. L. Welsh & N. D. Atwood: Rhodora 103: 81, fig. 3. (2001) |
Web links |