Oxytropis borealis var. borealis
Oxytropis borealis var. hudsonica
boreal locoweed
Hudson bay locoweed
1–18 cm;
leaflets (17 or)19–27(–37), blade apex acute to obtuse or rounded.
mostly 1.5–8 cm;
leaflets 19–33, blades 1.5–6 mm.
5–10-flowered, subcapitate or loose.
densely 3–6(–16)-flowered, subcapitate to short-spicate.
4–15 cm, subequal to or surpassing leaves, axis 0.5–2.5 cm in fruit, densely hirsute at least distally, hairs fuscous or mixed black and paler.
2.5–7 cm, axis to 1 cm in fruit, sparsely villous-pilose.
purple, lilac, or whitish, 13–17 mm;
wing blades dilated distally to 3.5–5 mm.
purplish, 11–16 mm;
wing blades not especially dilated distally.
8–10(–12) mm, tube 5–6 mm, lobes (2–)3–4(–8) mm.
7.5–8 mm, tube 6–6.5 mm, lobes 1–1.5 mm, not or obscurely verrucose.
10–18 × 5–7 mm.
8–15 × 5–7 mm.
= 48.
= 16.
Oxytropis borealis var. borealis
Oxytropis borealis var. hudsonica
Variety borealis is readily identified by the combination of relatively few leaflets, many flowers, and condensed, copiously hirsute inflorescences. Specimens from the interior, such as those in Denali National Park and at Black Rapids Glacier, Alaska, have racemes somewhat elongate and wing petals particularly widened near the apex.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Variety hudsonica is closely allied to, and transitional with, var. viscida, from which it differs mainly in the usually smaller size, relatively short calyx lobes, and less marked glandularity. None of these characters is definitive in all instances, either alone or in combination.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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