Lupinus oreganus
Kincaid's lupine, Oregon lupine
erect, usually unbranched.
cauline (few and large) and basal (persistent until after anthesis);
stipules 11 mm;
petiole 5–20 cm;
leaflets (7–)9–11(or 12), blades 20–50(–80) × 5–12 mm, abaxial surface with long, appressed hairs, especially on margins and veins, adaxial surface usually glabrous.
loose, 11–40 cm;
flowers spirally arranged or whorled.
11–18 cm;
bracts deciduous, 5 mm.
5–12 mm.
fragrant, 8–13 mm;
calyx bulge or spur 0–1 mm, abaxial lobe entire, 6 mm, adaxial lobe notched, 4–6 mm;
corolla blue to purple, yellowish, or creamy white, banner distinctly ruffled, markedly concave on lateral face, banner glabrous or sparsely pubescent abaxially, wings glabrous, keel curved upward, lower keel margins glabrous, adaxial margin glabrous.
2–3 cm, glabrous.
deciduous, petiolate.
4 or 5.
= 48.
Lupinus oreganus
Lupinus oreganus is known from west of the Cascades from Douglas County, Oregon, northward to Lewis County in Washington. Historically, it was found in British Columbia in Victoria on Vancouver Island but has not been seen there since the 1920s and is now considered extirpated there.
Lupinus oreganus is a food plant for Fender’s Blue Butterfly, listed by ESA as endangered. Lupinus oreganus (as var. kincaidii) is listed as endangered in Washington. It is also listed as extirpated by the Committee on the Status of Endangered Wildlife in Canada and the Species at Risk Act.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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