Lupinus rivularis
river-bank lupine, stream bank lupine
decumbent, ascending, or erect, branched, dark brown to red, usually hollow.
cauline;
stipules 7–15 mm;
petiole 3–5 cm;
leaflets 5–9, blades 20–40 × 4–9 mm, adaxial surface glabrous.
open, 15–50 cm;
flowers ± whorled or not.
3–15 cm;
bracts deciduous, 8–10 mm.
5–10 mm.
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.
dark, 3–7 cm, sparsely hairy.
deciduous, petiolate.
7 or 8, mottled brown with black line, 3–4 mm.
Lupinus rivularis
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
