Oxytropis borealis var. borealis
Oxytropis borealis var. sulphurea
boreal locoweed
Beringian locoweed, boreal locoweed
1–18 cm;
leaflets (17 or)19–27(–37), blade apex acute to obtuse or rounded.
4–25 cm;
leaflets 19–35, blades 4–18 mm.
5–10-flowered, subcapitate or loose.
8–25-flowered, compact to loose.
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.
4–20+ cm, axis often (2–)3–15 cm in fruit, pilose.
purple, lilac, or whitish, 13–17 mm;
wing blades dilated distally to 3.5–5 mm.
white or bluish, keel tips maculate, 9–21 mm;
wing blades not especially dilated distally.
8–10(–12) mm, tube 5–6 mm, lobes (2–)3–4(–8) mm.
6–9 mm, tube 5–7 mm, lobes 2–4 mm, prominently tuberculate.
10–18 × 5–7 mm.
8–15 × 5–7 mm.
= 48.
Oxytropis borealis var. borealis
Oxytropis borealis var. sulphurea
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.)
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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