OregonFlora: Lupinus arboreus

	Lupinus arboreus
	tree lupine, yellow bush lupine
Habit	Plants perennial, 10–20 dm.
Stems	ascending to erect; woody, obscurely to slightly pubescent.
Leaves	cauline; leaflets 5–10(12), 15–60 × 4–10 mm, linear-elliptic to oblanceolate; tips acute, usually apiculate; surfaces abaxially pubescent to sericeous, adaxially glabrate to pubescent; petioles (15)20–40 mm.
Inflorescences	(4.5)7.5–21 cm; peduncles (3)5–11.5 cm; pedicels 5–11 mm.
Flowers	calyces 8–10 mm, not spurred; lips equal to subequal; corollas (12)14–18 mm, usually yellow, rarely yellow and blue or purple; banners typical type; spot absent.
Fruits	(20)30–70 mm, villous.
Seeds	2–8.

	Lupinus arboreus
Distribution	[WildflowerSearch map] [BONAP county map]
Discussion	Dunes, sandy areas. Flowering Apr–Jul. 0–300 m. Est, WV. CA, WA; north to British Columbia. Native and exotic. While usually occurring near the ocean, Lupinus arboreus is occasionally found further inland, often as an ornamental plant in parking lot vegetation strips. This species appears to be expanding its range northward. It may occasionally hybridize with L. littoralis.
Source	Flora of Oregon, volume 2, page 699 Paul Severns, Stephen Meyers, Christopher Royce
Sibling taxa	L. affinis, L. albicaulis, L. albifrons, L. arbustus, L. arbustus x Lupinus oreganus, L. arbustus x Lupinus sericeus, L. argenteus, L. bicolor, L. brevicaulis, L. breweri, L. latifolius, L. lepidus, L. leucophyllus, L. leucophyllus x Lupinus sericeus, L. littoralis, L. luteolus, L. microcarpus, L. nevadensis, L. onustus, L. oreganus, L. polyphyllus, L. pusillus, L. rivularis, L. sabinianus, L. sericeus, L. sulphureus, L. tracyi, L. uncialis
Web links	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

Lupinus arboreus

tree lupine, yellow bush lupine

Habit

Plants perennial, 10–20 dm.

Stems

ascending to erect; woody, obscurely to slightly pubescent.

Leaves

cauline;

leaflets 5–10(12), 15–60 × 4–10 mm, linear-elliptic to oblanceolate;

tips acute, usually apiculate;

surfaces abaxially pubescent to sericeous, adaxially glabrate to pubescent;

petioles (15)20–40 mm.

Inflorescences

(4.5)7.5–21 cm;

peduncles (3)5–11.5 cm;

pedicels 5–11 mm.

Flowers

calyces 8–10 mm, not spurred;

lips equal to subequal;

corollas (12)14–18 mm, usually yellow, rarely yellow and blue or purple;

banners typical type; spot absent.

Fruits

(20)30–70 mm, villous.

Seeds

2–8.

Lupinus arboreus

Distribution

[WildflowerSearch map]

[BONAP county map]

Discussion

Dunes, sandy areas. Flowering Apr–Jul. 0–300 m. Est, WV. CA, WA; north to British Columbia. Native and exotic.

While usually occurring near the ocean, Lupinus arboreus is occasionally found further inland, often as an ornamental plant in parking lot vegetation strips. This species appears to be expanding its range northward. It may occasionally hybridize with L. littoralis.

Source

Flora of Oregon, volume 2, page 699
Paul Severns, Stephen Meyers, Christopher Royce

Sibling taxa