Astragalus lentiginosus var. trumbullensis |
Astragalus lentiginosus var. antonius |
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freckled milkvetch, Mount Trumbull milkvetch |
freckled milkvetch, Mount San Antonio milkvetch, San Antonio milk vetch |
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Habit | Plants perennial, 30–45(–65) cm, herbage green or subglabrescent. | Plants perennial, 7–30 cm, herbage cinereous or silvery-canescent. |
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. |
3–8 cm; leaflets 11–19(or 21), blades obovate or elliptic, 2.5–11 mm, apex obtuse or emarginate. |
Racemes | loosely 4–15(–17)-flowered; axis elongating, 3–9.5 cm in fruit. |
10–15-flowered, short and compact in fruit; axis 0.5–4(–5) cm in fruit. |
Peduncles | 4.5–7.5 cm. |
(1–)2–5.5 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. |
9–10.5 mm; calyx 4.2–5.5 mm, tube 3.2–4 mm, lobes 0.8–1.4 mm; corolla 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 becoming stramineous, plumply ovoid-acuminate or subglobose, bladdery-inflated, 14–22(–30) × 10–16(–18) mm, papery, strigulose; beak erect, triangular, 3–6 mm, unilocular. |
Seeds | 14–28. |
20–26. |
Astragalus lentiginosus var. trumbullensis |
Astragalus lentiginosus var. antonius |
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Phenology | Flowering Apr (Sep). | Flowering late Apr–Jul. |
Habitat | Sandstone outcrops and gravel, with Agave, Ephedra, Mortonia, Purshia, and other warm-desert shrubs. | Ponderosa pine forests. |
Elevation | 900–1800 m. (3000–5900 ft.) | 1500–2600 m. (4900–8500 ft.) |
Distribution |
AZ |
CA |
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 antonius, from the eastern end of the San Gabriel Mountains in eastern Los Angeles and adjacent San Bernardino counties, is the homologue of var. sierrae, from which it differs by its much denser pubescence and mostly flat leaflets (D. Isely 1998). (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: 100, plate 2, figs. 7–9. (1945) |
Web links |