Oxytropis campestris var. dispar
Oxytropis campestris var. davisii
field locoweed
Davis locoweed, Davis' field locoweed, Davis' oxytrope
strongly dimorphic, 5–21 cm;
stipules usually concealed by vesture;
leaflets 19–25, scattered or subopposite, blades primary ones crowded, ovate, shorter, distally linear-lanceolate or narrowly oblong, 4–20 mm.
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.
8–15-flowered, ± open to elongate.
10–30+-flowered, elongate in fruit.
7–19(–26) cm, axis 3–8(–11) cm in fruit.
5–35(–38) cm, axis 2–8(–14) cm in fruit.
purple, blue, pink, white, yellowish, or polychrome (in populations), 17–19(–21) mm.
usually pink-purple and fading dark purple, or bluish, sometimes polychrome, 14–19 mm.
tube 6–6.5 mm, lobes 2–2.7 mm.
tube 4.2–6(–6.5) mm, lobes 1.3–3 mm.
13–18 × 3.5–5 mm.
10–14 × 3.5–5 mm.
= 32.
= 32.
Oxytropis campestris var. dispar
Oxytropis campestris var. davisii
Variety dispar is closely allied to var. spicata, from which it differs in the flowers being polychrome within populations and in the somewhat firmer texture of the pods. It may well be that var. dispar is the somewhat stabilized product of previous hybridization involving the disjunct pale-flowered var. spicata and the purple-flowered Oxytropis lambertii, common in the same region. However, the presence of var. johannensis, not far distant to the northeast, might account for the occurrence of darker colored flowers in this region.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
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