Astragalus lentiginosus var. trumbullensis |
Astragalus lentiginosus var. chartaceus |
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freckled milkvetch, Mount Trumbull milkvetch |
broadleaf milkvetch, cobweb milkvetch |
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Habit | Plants perennial, 30–45(–65) cm, herbage green or subglabrescent. | Plants perennial, 10–35 cm. |
Stems | diffuse and incurved-ascending, often red-tinged. |
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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. |
(2.5–)4–11 cm; leaflets (9 or)11–23, blades elliptic-oblanceolate, broadly oblong-oblanceolate, or obovate, (3–)5–17(–20) mm, apex obtuse or emarginate. |
Racemes | loosely 4–15(–17)-flowered; axis elongating, 3–9.5 cm in fruit. |
(5–)10–20-flowered, flowering from middle and distally, short and compact in fruit; axis (0.5–)1.5–4(–5.5) cm in fruit. |
Peduncles | 4.5–7.5 cm. |
(1–)2.5–6(–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. |
(12.5–)15–18.2 mm; calyx (6.2–)7.5–10.5 mm, tube (4.6–)5.2–6.7 mm, lobes 1.4–3.8 mm; corolla bright pink-purple with pale, striate eye. |
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. |
green, often red-mottled, becoming stramineous, usually strongly incurved, ovoid, lanceoloid-ovoid, or ovoid-acuminate, moderately inflated, 15–30(–40) × (7–)9–15 mm, bilocular, stiffly papery or almost leathery, usually glabrous, rarely puberulent; beak well-defined, triangular or deltoid, 6–15 mm, unilocular. |
Seeds | 14–28. |
24–34(–38). |
Astragalus lentiginosus var. trumbullensis |
Astragalus lentiginosus var. chartaceus |
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Phenology | Flowering Apr (Sep). | Flowering May–Jul. |
Habitat | Sandstone outcrops and gravel, with Agave, Ephedra, Mortonia, Purshia, and other warm-desert shrubs. | Sagebrush, pinyon-juniper, and mixed desert shrub communities, on alluvial silt, igneous gravel. |
Elevation | 900–1800 m. (3000–5900 ft.) | 1400–2200 m. (4600–7200 ft.) |
Distribution |
AZ |
NV; UT |
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 chartaceus is widespread from central to western Utah into northeastern and central Nevada, there intergrading with vars. fremontii, kennedyi, and toyabensis. S. L. Welsh (2007) discussed the problems of including this variety in an expanded var. diphysus and its complex relationships to other varieties. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. araneosus, A. lentiginosus var. araneosus | |
Name authority | S. L. Welsh & N. D. Atwood: Rhodora 103: 81, fig. 3. (2001) | M. E. Jones: Proc. Calif. Acad. Sci., ser. 2, 5: 673. (1895) |
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