Lupinus arbustus
Lupinus latifolius
grassland lupine (ssp. neolaxiflorus), long-spur lupine, Montana lupine (ssp. pseudoparviflorus), spur lupine
broad-leaf lupine
erect, ascending, or decumbent, branched.
erect or spreading, branched or unbranched.
cauline and basal;
stipules 4–9 mm;
petiole 2–16 cm;
leaflets 7–10(–13), blades 20–70 × 3–15 mm, adaxial surface strigose.
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.
open, 3–18 cm;
flowers whorled.
16–60 cm;
flowers whorled or spirally arranged.
2–5 cm;
bracts deciduous, 3–6 mm.
8–20 cm;
bracts deciduous, 8–12 mm.
1–7 mm.
2–12 mm.
8–14 mm;
calyx spur distinct, 1–3 mm, abaxial lobe 3-toothed, 2.5–5 mm, 1–3 mm, adaxial lobe 2-toothed, 2–4 mm;
corolla blue, purple, pink, white, or yellowish, banner patch white, yellowish, or absent, banner hairy abaxially, wings with dense hair patch outside near tip, lower keel margins glabrous, adaxial margin ciliate.
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.
2–3 cm, silky.
2–4.5 cm, ± densely hairy.
deciduous, petiolate.
deciduous, petiolate.
3–6, tan, 5–6 mm.
6–10, mottled dark brown, 3–4 mm.
Lupinus arbustus
Lupinus latifolius
Lupinus arbustus is known from the Cascade and Klamath ranges, San Gabriel Mountains, Sierra Nevada, and the Great Basin area in California; Owyhee Desert in Idaho and Oregon; eastern Washington and western Montana; and western Juab and Tooele counties, Utah.
Lupinus arbustus is separated from the argenteus group by the presence of hairs on the corolla wings. Recognition of subspecies and varieties of this already complex species leads to precarious separation among taxa.
Lupinus variegatus A. Heller (1912, not Poiret 1814) is an illegitimate name that pertains here.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
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
- 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
