Lupinus arbustus
Lupinus antoninus
longspur lupine, spur lupine
ascending to erect, sometimes decumbent, not woody, pubescent to sericeous.
mostly cauline;
leaflets 6–10(11), 15–60 × 2–11 mm, linear-oblanceolate to oblanceolate;
tips acute, often apiculate;
surfaces usually pubescent, sometimes glabrate adaxially;
petioles 22–93(166) mm.
(6.4)7–16.5(21.9) cm;
peduncles (1.5)2–8.4 cm;
pedicels (2)3–6 mm.
calyces 3–6 mm, spurred;
lips unequal;
corollas 7–14 mm, blue, purple, yellow, or white;
banners cup type; spot absent or white to yellow;
wings usually with tuft of hair near tips.
1.5–3.5 cm, pilose.
3–6.
Lupinus arbustus
Lupinus antoninus
Rocky areas, meadows, open slopes, sagebrush, open forests. Flowering Apr–Sep. 0–2600 m. BR, BW, Casc, Col, ECas, Lava, Owy, Sisk, WV. CA, ID, NV, WA; north to British Columbia, northeast to MT, southeast to UT. Native.
This species hybridizes with L. oreganus, L. albicaulis, and potentially other broadly sympatric, perennial lupines.
Paul Severns, Stephen Meyers, Christopher Royce
- 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
