Astragalus lentiginosus var. vitreus |
Astragalus lentiginosus var. negundo |
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freckled milkvetch, glass freckled milkvetch |
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Habit | Plants perennial, 15–40 cm. | Plants perennial, 19–32 cm. |
Stems | glabrous or glabrate. |
diffuse and incurved-ascending, often red- or purple-tinged. |
Leaves | 4.5–10 cm; leaflets (7–)13–19, blades obovate-cuneate or oblong-obovate, (5–)7–17(–21) mm, apex obtuse or truncate-emarginate. |
(2.5–)4–11 cm; leaflets (7–)13–19, blades elliptic-oblanceolate, broadly oblong-oblanceolate, or obovate, (2–)5–17 mm, apex obtuse or emarginate. |
Racemes | loosely (10–)15–27-flowered, lax and open in fruit; axis 4–8.5 cm in fruit. |
5–11-flowered, flowering from middle and distally, short and compact in fruit; axis 0.5–5 cm in fruit. |
Peduncles | 4–9.5 cm. |
2.2–5 cm. |
Flowers | 13.2–17 mm; calyx 6.5–8 mm, tube 4.6–5.7 mm, lobes (1.5–)1.7–2.3 mm; corolla pink-purple or lavender with white wing tips. |
12.5–14.5 mm; calyx 7.5–10.2 mm, tube 5.2–5.8 mm, lobes 1.8–4.4 mm; corolla bright pink-purple with pale, striate eye. |
Legumes | pale green and unmottled turning pallid, usually broadly ovoid, rarely lunately lanceoloid-acuminate, usually strongly inflated, rarely less so, 15–25 × (7–)9–15 mm, papery-membranous, subtranslucent, lustrous, glabrous; beak triangular, short, unilocular. |
purplish, often red-mottled, becoming stramineous, ellipsoid to lanceoloid-ovoid or ellipsoid-acuminate, moderately inflated, 23–34 × 6–15 mm, bilocular, stiffly papery or almost leathery, usually glabrous, rarely puberulent; beak well-defined, triangular or deltoid, 7–12 mm, unilocular. |
Seeds | 21–31. |
40. |
2n | = 22. |
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Astragalus lentiginosus var. vitreus |
Astragalus lentiginosus var. negundo |
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Phenology | Flowering Apr–Jun. | Flowering late Apr–Jun. |
Habitat | Gullied badlands and desert flats, on sand or clay derived from sandstone or limestone, on volcanic gravel. | Salt and sand desert shrub communities with shadscale, greasewood, sagebrush, and horsebrush, in pinyon-juniper communities. |
Elevation | 800–1500(–2000) m. (2600–4900(–6600) ft.) | 1400–1700(–2300) m. (4600–5600(–7500) ft.) |
Distribution |
AZ; UT |
UT |
Discussion | Variety vitreus is found in the valleys of the upper Virgin River and Kanab Creek, southward to the northern slope of the Kaibab Plateau, and Toroweap and House Rock valleys in eastern Washington and western Kane counties in Utah, and northern Mohave and northwestern Coconino counties in Arizona. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Variety negundo, which is known from Box Elder, Millard, and Tooele counties, fills a portion of the gap in distribution between var. platyphyllidius, with which it shares relatively thick-textured fruits, and var. chartaceus, with which it is transitional to the south. From either taxon, the elongated fruit is evidently diagnostic, apparent only as fruits approach maturity. The lower flower number is characteristic of var. negundo and is more or less diagnostic. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Name authority | Barneby: Leafl. W. Bot. 4: 119, plate 3, figs. 30–33. (1945) | S. L. Welsh & N. D. Atwood in S. L. Welsh: N. Amer. Sp. Astragalus, 302, fig. 285u. (2007) |
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