Oxytropis campestris var. davisii
Oxytropis campestris var. wanapum
Davis locoweed, Davis' field locoweed, Davis' oxytrope
field locoweed, Wanapum crazyweed, Wanapum locoweed
3–17(–25) cm;
stipules free ends 5–6 mm, sparsely pilose abaxially, margins ciliate, sometimes also with clavate processes;
leaflets 25–39(–45), sometimes fasciculate, blades 4–20(–29) 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.
10–30+-flowered, elongate in fruit.
(5 or)6–12-flowered.
5–35(–38) cm, axis 2–8(–14) cm in fruit.
(10–)17–21(–30) cm, axis (4–)6–8(–12) cm in fruit.
usually pink-purple and fading dark purple, or bluish, sometimes polychrome, 14–19 mm.
pale lavender, banner veined, keel tip maculate with purplish blue, 14–20(–23) mm.
tube 4.2–6(–6.5) mm, lobes 1.3–3 mm.
tube 5–7 mm, lobes (1–)2–3 mm.
10–14 × 3.5–5 mm.
13–23 × 3.5–5 mm.
= 32.
Oxytropis campestris var. davisii
Oxytropis campestris var. wanapum
Variety davisii is readily distinguished by the combination of its colorful flowers, fasciculate leaflets (or the tendency toward fasciculate leaflets), and elongate inflorescences. It forms apparent intermediates with Oxytropis sericea var. speciosa and at the southern portion of its range is more or less transitional to var. spicata. A relationship with var. johannensis cannot be discounted, especially with those portions of that variety with fasciculate leaflets. Specimens transitional to O. splendens make assignment of materials to one or the other difficult in particular instances.
(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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