Oxytropis campestris var. dispar
Oxytropis campestris var. jordalii
field locoweed
jordal's field locoweed, jordal's locoweed, jordal's 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.
1.5–9 cm;
stipules glabrous or strigose abaxially, margins ± ciliate, apex often bristly;
leaflets 9–19, scattered or opposite, blades 1–11 mm.
8–15-flowered, ± open to elongate.
usually 2–9-flowered, subcapitate or somewhat elongate.
7–19(–26) cm, axis 3–8(–11) cm in fruit.
3–12(–14) cm, axis 1–4.5 cm in fruit.
purple, blue, pink, white, yellowish, or polychrome (in populations), 17–19(–21) mm.
whitish or yellowish, sometimes polychrome, 10–14(–15) mm.
tube 6–6.5 mm, lobes 2–2.7 mm.
tube (3.7–)4–5.5 mm, lobes 1–1.5 mm.
13–18 × 3.5–5 mm.
9–12 × 3.5–5 mm.
= 32.
= 32.
Oxytropis campestris var. dispar
Oxytropis campestris var. jordalii
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 jordalii is transitional to vars. roaldii and varians. Data from J. L. Jorgensen et al. (2003) give some support to O. jordalii and O. varians as distinct species.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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