Oxytropis borealis var. hudsonica
Oxytropis borealis var. sulphurea
Hudson bay locoweed
Beringian locoweed, boreal locoweed
mostly 1.5–8 cm;
leaflets 19–33, blades 1.5–6 mm.
4–25 cm;
leaflets 19–35, blades 4–18 mm.
densely 3–6(–16)-flowered, subcapitate to short-spicate.
8–25-flowered, compact to loose.
2.5–7 cm, axis to 1 cm in fruit, sparsely villous-pilose.
4–20+ cm, axis often (2–)3–15 cm in fruit, pilose.
purplish, 11–16 mm;
wing blades not especially dilated distally.
white or bluish, keel tips maculate, 9–21 mm;
wing blades not especially dilated distally.
7.5–8 mm, tube 6–6.5 mm, lobes 1–1.5 mm, not or obscurely verrucose.
6–9 mm, tube 5–7 mm, lobes 2–4 mm, prominently tuberculate.
8–15 × 5–7 mm.
8–15 × 5–7 mm.
= 16.
Oxytropis borealis var. hudsonica
Oxytropis borealis var. sulphurea
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.)
There are many transitional forms between vars. sulphurea and viscida in the broad sense. The materials included here are plottable in the herbarium and notable in the field. Many of the plants are small-flowered (ca. 12 mm) and, consequently, have narrow racemes. Large-flowered phases are present and, in some, the bracts are very long, surpassing the flowers at anthesis.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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