Astragalus mollissimus var. matthewsii |
Astragalus mollissimus var. mollissimus |
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Matthews woolly locoweed, woolly locoweed |
woolly locoweed |
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Habit | Plants acaulescent or subacaulescent. | Plants usually shortly caulescent, sometimes subacaulescent, to 45 cm. |
Stems | to 1.5 cm, obscured by imbricate stipules. |
1.5–18 cm, internodes to 4 cm or obscured by imbricate stipules. |
Leaves | (3–)5–12 cm; stipules (3–)4–8 mm; leaflets 11–23, blades obovate, 3–12 mm. |
(7–)10–20(–25) cm; stipules (5–)7–17 mm; leaflets 15–27(–33), blades usually oval, ovate, or obovate, sometimes rhombic-elliptic, 5–22 mm. |
Racemes | (5–)7–12-flowered; axis (0.5–)1–4.5 cm in fruit, not or scarcely surpassing foliage. |
(10–)15–40-flowered; axis elongating, (2–)4–17 cm in fruit. |
Peduncles | scapiform, (1.5–)2.5–8 cm. |
6–23 cm. |
Flowers | calyx 10–13 mm, tube 7–8.6 × 3.4–4.7 mm, lobes 2.4–5.2 mm; corolla pale purple; banner 18.5–22.5 mm; keel 14.2–18 mm. |
calyx (8.8–)10.5–14 mm, tube 6.8–9.5 × 3.4–4.5 mm, lobes (2–)3–5 mm; corolla pinkish, pink-purple, pale yellow, or yellowish suffused with dull lavender; banner (16–)17.5–21.5 mm; keel 14–18 mm. |
Legumes | gently or abruptly incurved distally, broadly ovoid, turgid, 12–18 × 7–13 mm, widest near obtuse or truncate base, densely villous-tomentose; beak bilocular. |
shallowly crescentic or abruptly incurved near middle through ± 90°, contracted distally, narrowly oblong-ellipsoid to lanceoloid-ellipsoid, 14–24 × 4–7 mm, mostly glabrous and apex usually puberulent or hispidulous, rarely puberulent, sometimes shortly villosulous throughout; beak unilocular. |
Seeds | 24–31. |
26–37. |
2n | = 22. |
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Astragalus mollissimus var. matthewsii |
Astragalus mollissimus var. mollissimus |
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Phenology | Flowering Apr–Jun. | Flowering Apr–Jul. |
Habitat | Open slopes and hilltops, in ponderosa pine forests, along canyons to juniper-pinyon belt, on light, sandy or gravelly, sedimentary, granitic, or volcanic soils. | Prairies, plains, valley floors, stony mesas, and fallow fields on alluvial loams, loess, on outcrops of shale, limestone, or sandstone, most abundant where vegetation is low and sparse. |
Elevation | 1900–2600 m. (6200–8500 ft.) | 500–1900 m. (1600–6200 ft.) |
Distribution |
AZ; NM |
CO; KS; NE; NM; OK; SD; TX; WY |
Discussion | Variety matthewsii is scattered and uncommon in Apache County in eastern Arizona and from Santa Fe to McKinley counties in the mountains of north-central and northwestern New Mexico. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Flowers of var. mollissimus are normally dull purplish, but in some New Mexico populations they are a pure pale yellow, the basis of forma flavus McGregor. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | A. matthewsii, A. bigelovii var. matthewsii | |
Name authority | (S. Watson) Barneby: Mem. New York Bot. Gard. 13: 746. (1964) | unknown |
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