Astragalus canadensis var. canadensis
astragale du Canada, Canada milk-vetch, Canadian milk-vetch
usually branched or with spur branches 1 or several nodes preceding first peduncle, sometimes unbranched, robust, slender and almost solid, or stout and hollow, (35–)40–120(–160) cm.
(3.5–)5–25(–35) cm;
leaflets (9–)15–35, blades 6–45(–52) mm, apex obtuse, apiculate, or truncate-emarginate.
rarely loose, 3–16 × (2–)2.5–3 cm, flowers 11.3–16.3 mm.
slender or stout, (2.5–)4–12(–13) cm.
1.2–2.5 mm.
calyx (4.6–)5.5–9.6(–10.3) mm, lobes 1.5–5.5 mm;
corolla greenish white or dull stramineous.
terete or subterete, carinate by ventral suture, not grooved dorsally, (9–)10–15 × 4–5.2 mm, beak 2–6 mm, usually glabrous, rarely puberulent or strigulose.
(18–)20–26(or 27).
3–18 mm, proximalmost usually ruptured becoming irregularly circumscissile.
= 16.
Astragalus canadensis var. canadensis
R. C. Barneby (1964) circumscribed var. canadensis rather broadly to include multiracial variation. As reviewed by D. Isely (1998), several regional manuals (such as M. L. Fernald 1950) have recognized var. carolinianus and var. longilobus in the eastern states. The rationale, largely derived by N. C. Fassett (1939b), was extensively counter-argued by Barneby.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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