Astragalus lentiginosus var. trumbullensis |
Astragalus sect. Diphysi |
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freckled milkvetch, Mount Trumbull milkvetch |
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Habit | Plants perennial, 30–45(–65) cm, herbage green or subglabrescent. | Herbs annual, biennial, or perennial, caulescent or subacaulescent; caudex superficial or subterranean. |
Stems | single or few to many. |
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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. |
odd-pinnate, petiolate to subsessile; leaflets (3–)7–27(or 29). |
Racemes | loosely 4–15(–17)-flowered; axis elongating, 3–9.5 cm in fruit. |
loosely or remotely flowered or subumbellate, flowers ascending to spreading or declined. |
Peduncles | 4.5–7.5 cm. |
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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. |
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Corollas | usually white, lilac, purple, or pink- to magenta-purple, lavender, or violet, sometimes ochroleucous or yellowish, keel apex usually purple, banner recurved through 30–50°, keel apex round, obtuse, or bluntly deltate. |
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Calyx | tubes cylindric or campanulate. |
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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. |
usually deciduous, sometimes persistent, usually sessile, rarely short-stipitate, ascending, spreading, deflexed, or declined, linear, narrowly lanceoloid to oblanceoloid or ellipsoid, oblong, ovoid to obovoid, subglobose, or triangular-obcordate, ventral suture deeply grooved and appearing ± didymous, strongly inflated, terete, dorsiventrally compressed, or 3-sided compressed, straight or curved, usually bilocular, sometimes semibilocular or unilocular. |
Seeds | 14–28. |
(7–)10–42. |
Hairs | basifixed. |
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Stipules | distinct. |
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Astragalus lentiginosus var. trumbullensis |
Astragalus sect. Diphysi |
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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 |
w North America; nw Mexico |
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.) |
Species 3 (3 in the flora). Section Diphysi has wide distribution in western North America, from British Columbia southward to northwestern Mexico. One of the species, Astragalus lentiginosus, consists of 42 varieties and is as complex an assemblage as occurs in many genera. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Subordinate taxa | ||
Name authority | S. L. Welsh & N. D. Atwood: Rhodora 103: 81, fig. 3. (2001) | A. Gray: Proc. Amer. Acad. Arts 6: 192. (1864) |
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