Lupinus bicolor
Lupinus rivularis
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
river-bank lupine, stream bank lupine
ascending or erect, branched or unbranched.
decumbent, ascending, or erect, branched, dark brown to red, usually hollow.
cauline;
petiole 1–7 cm;
leaflets 5–8, blades 10–40 × 1–5 mm, adaxial surface glabrous or sparsely pubescent.
cauline;
stipules 7–15 mm;
petiole 3–5 cm;
leaflets 5–9, blades 20–40 × 4–9 mm, adaxial surface glabrous.
4–20 cm;
flowers usually in fewer than 5 whorls, sometimes spirally arranged.
open, 15–50 cm;
flowers ± whorled or not.
3–10 cm;
bracts deciduous, 4–6 mm.
3–15 cm;
bracts deciduous, 8–10 mm.
1–3.5 mm.
5–10 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.
12–16 mm;
calyx bulge or spur 0–1 mm, abaxial lobe entire or ± 3-toothed, 7–9 mm, adaxial lobe 2-toothed, 7–8 mm;
corolla violet, banner glabrous abaxially, lower keel margins glabrous, adaxial margin ciliate claw to tip.
1–3 × 0.3–0.6 cm, pubescent.
dark, 3–7 cm, sparsely hairy.
deciduous, petiolate.
deciduous, petiolate.
5–8.
7 or 8, mottled brown with black line, 3–4 mm.
= 48.
Lupinus bicolor
Lupinus rivularis
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 rivularis ranges from Mendocino County in California northward through Oregon and Washington. It has been confirmed in British Columbia (where it is of conservation concern) in the extreme southwestern corner of the province, with a single population on southern Vancouver Island and five populations in the lower Fraser Valley.
Lupinus rivularis is distinguished by its absence of wood, banners that are glabrous abaxially, ciliate keels, glabrous leaf surfaces, and violet flowers. It grades into blue-flowered L. arboreus but blooms earlier (late winter, spring) and is not sweet-smelling. L. L. Phillips (1955) considered L. rivularis as synonymous with L. albicaulis.
Lupinus rivularis is widely planted for erosion control in western Oregon; it is of conservation concern in Canada.
(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
- 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
