Lupinus hyacinthinus
Lupinus rivularis
hyacinth lupine, San Jacinto lupine
river-bank lupine, stream bank lupine
erect, unbranched or branched distally.
decumbent, ascending, or erect, branched, dark brown to red, usually hollow.
cauline;
stipules not leaflike, green to silvery, 5–16 mm;
petiole 3–6 cm;
leaflets 7–12, blades 30–80 × 4–8 mm, adaxial surface sparsely pubescent.
cauline;
stipules 7–15 mm;
petiole 3–5 cm;
leaflets 5–9, blades 20–40 × 4–9 mm, adaxial surface glabrous.
4–22 cm;
flowers ± whorled.
open, 15–50 cm;
flowers ± whorled or not.
3–12 cm;
bracts deciduous, 5–9 mm.
3–15 cm;
bracts deciduous, 8–10 mm.
2–6 mm.
5–10 mm.
13–16 mm;
calyx bulge or spur 0–1 mm, abaxial lobe entire or 3-toothed, 7–11 mm, adaxial lobe 2-toothed, 6–10 mm;
corolla light blue to purple, banner patch yellowish to white, banner glabrous abaxially, keel upcurved, glabrous, banner ovate, wings wide, covering keel tip.
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.
3–4 cm, silky.
dark, 3–7 cm, sparsely hairy.
deciduous, petiolate.
deciduous, petiolate.
3–7, beige, speckled brown, 4–6 mm.
7 or 8, mottled brown with black line, 3–4 mm.
Lupinus hyacinthinus
Lupinus rivularis
Lupinus hyacinthinus is found in southern California in the San Gabriel, San Jacinto, and Santa Rosa mountains and on the Sierra San Pedro Mártir in Baja California. It is distinguished from its close relatives by its larger flowers in combination with green (versus gray or dull green) leaves.
(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
