Oxytropis campestris var. roaldii
Oxytropis campestris var. columbiana
roald's locoweed
field locoweed, slender crazyweed
2–11 cm;
stipules glabrous or strigose abaxially, margins ± ciliate, apex often bristly;
leaflets 11–21, scattered or opposite, blades 4–8.5 mm.
(5–)8–17 cm;
stipules usually pilose, sometimes glabrescent abaxially, margins sometimes ciliate;
leaflets 11–17(or 19), opposite or subopposite, blades 9–30 mm.
usually 8–12(–14)-flowered, subcapitate or somewhat elongate.
10–28-flowered.
3–12 cm, axis 1.5–4.5 cm in fruit.
(8–)12–30 cm, axis 2–10 cm in fruit.
lavender or pink-purple, sometimes polychrome, 13–16(–17) mm.
white, banner often veined, keel tip maculate with purplish blue, 15–20(–22) mm.
tube (3.7–)4.5–5 mm, lobes (1–)1.2–2(–2.7) mm.
tube 5–6.5 mm, lobes (1.8–)2.5–4 mm.
9–15 × 4–6 mm.
16–23 × 5–7 mm.
= 64.
= 48.
Oxytropis campestris var. roaldii
Oxytropis campestris var. columbiana
Variety roaldii has flowers that are usually larger, calyx lobes that are usually longer, and other subtle differences aside from flower color that allow segregation from var. jordalii. However, there are intermediate specimens, and in some places, especially on gravel bars, flower color grades within populations. A similar pattern is to be noted between the partially sympatric vars. davisii and spicata in the mountains of Alberta, and between other varieties situated elsewhere. The Pan-Arctic Flora (http://panarcticflora.org/) recognizes Oxytropis roaldii as a distinct species.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Variety columbiana is distinguished by the combination of small number of leaflets, whitish flowers with maculate keels, and its soft, silky pubescence; it is very similar to var. spicata, with which it is somewhat transitional. It differs in about the same manner as other varieties in this complex group of infraspecific taxa. Most of the Washington populations appear to have been eradicated by storage water in a reservoir. This variety is known currently mainly from islands in, and points around, Flathead Lake, Lake County, Montana. The tendency toward relatively large flowers and only 11–17 leaflets is similar to the so-called cervinus phase of var. spicata, which is common some distance north of Flathead Lake and extending into British Columbia.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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