Lupinus latifolius
Lupinus luteolus
broad-leaf lupine
bushy yellow lupine, butter lupine, pale yellow lupine
erect or spreading, branched or unbranched.
ascending or erect, branched near middle or unbranched.
cauline, basal when present withered by anthesis;
stipules 5–10 mm;
petiole 4–20 cm;
leaflets 5–11, blades 40–100 × 6–24 mm, abaxial surface ± hairy, adaxial surface glabrous or hairy.
cauline;
petiole 2–5 cm;
leaflets 7–9, blades 10–30 × 4–9 mm, adaxial surface usually pubescent.
16–60 cm;
flowers whorled or spirally arranged.
9–35 cm;
flowers in crowded whorls.
8–20 cm;
bracts deciduous, 8–12 mm.
4–15 cm;
bracts persistent, reflexed, 5–11 mm, pubescent.
2–12 mm.
1–3 mm.
8–18 mm;
calyx abaxial lobe entire or notched, 4–8 mm, adaxial lobe entire or 2-toothed, 5–10 mm;
corolla blue or purple to white, banner patch usually white to yellowish turning purple, banner glabrous abaxially, lower keel margins usually ciliate, adaxial margin ciliate from claw to middle.
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.
2–4.5 cm, ± densely hairy.
1–1.5 cm, pubescent.
deciduous, petiolate.
persistent or deciduous, disclike (leaving a circular scar), sessile.
6–10, mottled dark brown, 3–4 mm.
2, dark brown, tuberculate.
Lupinus latifolius
Lupinus luteolus
Varieties 5 (5 in the flora).
Various authors have differed in their circumscriptions of Lupinus latifolius. For example, P. K. Vaughn and D. B. Dunn (1977) recognized three varieties, D. Isely (1998) recognized six varieties, and C. L. Hitchcock et al. (1955–1969, vol. 3) recognized three varieties. The most conservative approach has been taken here by recognizing taxa that have the clearest characteristics, but that approach might not reflect phylogeny. Research is needed to clarify the varieties and particularly the relationships among L. latifolius and L. arcticus, L. perennis, and L. polyphyllus.
Lupinus latifolius is known to cause birth defects in livestock (R. F. Keeler et al. 1977).
(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.)
1. Flowers 8–14 mm. | → 2 |
2. Flowers 10–14(–16) mm. | var. latifolius |
2. Flowers 8–10(–12) mm. | var. viridifolius |
1. Flowers 12–18 mm. | → 3 |
3. Stems densely hairy, not hollow; San Francisco Bay area, California. | var. dudleyi |
3. Stems glabrate or sparsely strigose, hollow; sw California or n Oregon to British Columbia. | → 4 |
4. Herbs 5–20 dm, caudex often unbranched; Arizona, California. | var. parishii |
4. Herbs 2.5–6 dm, caudex branched; n Oregon to British Columbia. | var. subalpinus |
- 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
