Astragalus convallarius var. convallarius
Astragalus convallarius var. scopulorum
lesser rushy milkvetch
lesser rushy milkvetch, Rocky Mountain milkvetch
(10–)20–50(–70) cm.
20–50 cm.
0 or 3–11, blades 2–25(–33) mm.
3–13 proximally, some distal leaves reduced to naked rachis or with at most 1 pair of filiform leaflets, blades 2–25(–33) mm.
1–5 mm.
0.6–2.3 mm.
8–11 mm;
calyx 4.2–6 mm, tube 3.4–4.8 mm, lobes 0.4–1.4 mm.
(6.6–)8.1–11.2 mm;
calyx 4–6.3 mm, tube (3.5–)3.8–5.4 mm, lobes 0.5–1.1 mm.
linear, 25–50(–53) × 2.5–3.3(–4.2) mm, length 8–18 times width, gradually or abruptly contracted to ± symmetric apex.
oblanceoloid, 20–35 × 2.3–4 mm, tapering downward into calyx from obliquely triangular apex.
13–20.
11–17.
0.
0–2.
Astragalus convallarius var. convallarius
Astragalus convallarius var. scopulorum
Variety convallarius demonstrates considerable variability in presence or absence of leaflets, length of fruits, shape and length of calyx-lobes, pubescence coloration in the inflorescences, and degree of development of the stipelike bases of the fruits. Various combinations of these features in the past have resulted in recognition of several taxa. R. C. Barneby (1947c) detailed and summarized variation in the complex.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Variety scopulorum is mostly from the valleys of the Grand and Gunnison rivers in west-central Colorado. It differs from var. convallarius primarily in the fruits that taper from obliquely triangular apices to the narrower bases at the calyces.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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