Oxytropis campestris var. minor
Oxytropis campestris var. wanapum
field locoweed, oxytrope mineur
field locoweed, Wanapum crazyweed, Wanapum locoweed
(2–)3–10(–13) cm;
stipules glabrous or glabrate abaxially, margins eciliate;
leaflets 11–23(–27), opposite or subopposite, blades 2–10 mm.
(11–)14–18(–22) cm;
stipules pilose abaxially, margins ciliate;
leaflets (13–)19–25(–33), scattered or subopposite, blades linear to narrowly oblong, (8–)15–25(–33) mm.
(3–)5–9-flowered, subcapitate.
(5 or)6–12-flowered.
curved-ascending, 3–15(–18) cm, axis 0.3–1.5 cm in fruit.
(10–)17–21(–30) cm, axis (4–)6–8(–12) cm in fruit.
purple fading violet, 11–18 mm.
pale lavender, banner veined, keel tip maculate with purplish blue, 14–20(–23) mm.
tube 5–6.5 mm, lobes deltate, 0.5–1.5(–2) mm.
tube 5–7 mm, lobes (1–)2–3 mm.
10–22 × 3.5–5 mm.
13–23 × 3.5–5 mm.
= 48.
Oxytropis campestris var. minor
Oxytropis campestris var. wanapum
Putative reports of var. minor from the Mackenzie Mountains are probably referable to the purple-flowered var. roaldii, from which var. minor differs in its flowers that average larger, and in the longer calyx tube. There are several specimens from Churchill, Manitoba, that have been variously assigned to vars. johannensis, minor, or varians. Field studies of these populations need to be undertaken to resolve this problem. The Pan-Arctic Flora (http://panarcticflora.org/) treats this taxon as a distinct species, Oxytropis terrae-novae (with O. campestris var. johannensis as a synonym).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Variety wanapum is restricted to xeric, basaltic gravels, talus, or outcrops in Grant County. Its flowers, suffused with purple, are diagnostic since no other varieties of the species in the Pacific Northwest typically have colored flowers. The narrow-bladed leaflets tend to be involute and to vary in number, usually 19–25. These vegetative features are unlike any of the other several varieties of Oxytropis campestris that occur elsewhere in North America and have lavender to purplish flowers.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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