Astragalus canadensis var. mortonii
Canada milk-vetch, Canadian milk-vetch, Morton's Canadian milkvetch, Morton's milkvetch
unbranched, relatively slender, (25–)30–70(–90) cm.
(3–)6–19(–22.5) cm;
leaflets (9–)13–19(or 21), blades 10–45(–50) mm, thin.
sometimes interrupted proximally, 2.5–12 × 2.7–3.5 cm, flowers (12.6–)13.2–16.5 mm.
rather slender, 6–22 cm.
1.4–2 mm.
calyx (6.5–)7.4–10.5(–11) mm, lobes (1.5–)2–4.4 mm, adaxial pair usually not much broader (though sometimes shorter) than the rest;
corolla greenish white or ochroleucous.
grooved dorsally, (9–)11–20 × 3–5 mm, beak (3–)3.5–5 mm, thinly strigose or glabrate;
septum (2–)2.5–3.4 mm wide.
(16–)18–26.
3.5–11(–14) mm, proximalmost persistent, not ruptured.
= 16.
Astragalus canadensis var. mortonii
A. Gray (1864), under the discussion of Astragalus mortonii, cited both A. spicatus Nuttall ex Torrey & A. Gray (an illegitimate name, not Pallas 1773), and A. tristis Nuttall ex Torrey & A. Gray (see synonymy of var. brevidens), but considered ovary and legume pubescence as the primary distinguishing feature. This is commonly an elongate, slender plant with thin-textured foliage of forested regions within its range. The flowers vary in color from greenish white to cream, sometimes suffused with purple, but dry to cream or brownish. Flowers are ascending in bud but soon become spreading to declined, until in fruit they are erect-ascending.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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