Oxytropis campestris var. roaldii
roald's locoweed
2–11 cm;
stipules glabrous or strigose abaxially, margins ± ciliate, apex often bristly;
leaflets 11–21, scattered or opposite, blades 4–8.5 mm.
usually 8–12(–14)-flowered, subcapitate or somewhat elongate.
3–12 cm, axis 1.5–4.5 cm in fruit.
lavender or pink-purple, sometimes polychrome, 13–16(–17) mm.
tube (3.7–)4.5–5 mm, lobes (1–)1.2–2(–2.7) mm.
9–15 × 4–6 mm.
= 64.
Oxytropis campestris var. roaldii
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.)
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