Lupinus bicolor
Lupinus luteolus
bicolor lupine, field lupine, Lindley's annual lupine, Lindley's lupine, lupine, miniature lupine, Montana lupine, small-flower lupine, two-color lupine, two-colour lupine
bushy yellow lupine, butter lupine, pale yellow lupine
ascending or erect, branched or unbranched.
ascending or erect, branched near middle or unbranched.
cauline;
petiole 1–7 cm;
leaflets 5–8, blades 10–40 × 1–5 mm, adaxial surface glabrous or sparsely pubescent.
cauline;
petiole 2–5 cm;
leaflets 7–9, blades 10–30 × 4–9 mm, adaxial surface usually pubescent.
4–20 cm;
flowers usually in fewer than 5 whorls, sometimes spirally arranged.
9–35 cm;
flowers in crowded whorls.
3–10 cm;
bracts deciduous, 4–6 mm.
4–15 cm;
bracts persistent, reflexed, 5–11 mm, pubescent.
1–3.5 mm.
1–3 mm.
4–10 mm;
calyx abaxial lobe entire, 4–6 mm, adaxial lobe deeply cleft, 2–4 mm;
corolla usually blue, rarely light blue, pink, or white, banner spot white, becoming magenta, upper keel margins usually ciliate near apex, rarely glabrous, sometimes blunt, banner longer than wide.
10–16 mm;
calyx appendages usually absent, abaxial lobe entire, 6–10 mm, adaxial lobe entire, 3–5 mm;
corolla usually pale yellow, sometimes pinkish or bright blue, lower wing margins rarely ciliate, upper margins ciliate near claw, lower and upper keel margins densely ciliate near claw.
1–3 × 0.3–0.6 cm, pubescent.
1–1.5 cm, pubescent.
deciduous, petiolate.
persistent or deciduous, disclike (leaving a circular scar), sessile.
5–8.
2, dark brown, tuberculate.
= 48.
Lupinus bicolor
Lupinus luteolus
Lupinus bicolor is naturalized in Arizona. The named subspecies and varieties do not conform to consistently recognizable geographical or morphological entities (D. B. Dunn 1955). Vigorous plants with larger flowers may be confused with L. nanus. In California, plants on the Outer North Coast Ranges may persist for two growing seasons. Lupinus bicolor (as L. polycarpus) has been reported from Alabama (A. R. Diamond 2016) and Michigan (E. G. Voss and A. A. Reznicek 2012).
Lupinus micranthus Douglas (1829, not Gussone 1828) is an illegitimate name that pertains here.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Lupinus luteolus is known primarily from the North Coast area in California, with isolated collections from the Diablo Range and Western Transverse Ranges. It is known from Oregon in Douglas, Jackson, and Klamath counties.
Lupinus luteolus from Siskiyou County in California to the Klamath Range of southern Oregon and northern California often (in about 50% of specimens) has leaflets that are glabrous adaxially. Plants from Round Valley, Mendocino County, are unusually tall and sometimes have flowers blue at anthesis; they are sometimes recognized as L. milobakeri.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
- Local floras:
BC, 
CA, 
OR, 
WA - Local Web sites: CalFlora, CalPhotos,
Flora NW, 
PNW Herbaria, Turner Photog. 
WildflowerSearch
iNaturalist (observations)
USDA Plants Database- LBJ Wildflower Center
- SEINet
- Plants of the World Online
- Encyclopedia of Life
- Wikipedia
- Google Image Search
