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Lupinus arbustus

longspur lupine, spur lupine

tree lupine, yellow bush lupine

Habit Plants perennial, 2–8 dm. Plants perennial, 10–20 dm.
Stems

ascending to erect, sometimes decumbent, not woody, pubescent to sericeous.

ascending to erect; woody, obscurely to slightly pubescent.

Leaves

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.

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

(6.4)7–16.5(21.9) cm;

peduncles (1.5)2–8.4 cm;

pedicels (2)3–6 mm.

(4.5)7.5–21 cm;

peduncles (3)5–11.5 cm;

pedicels 5–11 mm.

Flowers

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.

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

1.5–3.5 cm, pilose.

(20)30–70 mm, villous.

Seeds

3–6.

2–8.

Lupinus arbustus

Lupinus arboreus

Distribution
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[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

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.

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 draft
Paul Severns, Stephen Meyers, Christopher Royce
Flora of Oregon, volume 2, page 699
Paul Severns, Stephen Meyers, Christopher Royce
Sibling taxa
L. affinis, L. albicaulis, L. albifrons, L. arboreus, 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
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
Synonyms Lupinus caudatus, Lupinus caudatus var. submanes, Lupinus caudatus var. subtenellus, Lupinus laxiflorus, Lupinus laxiflorus var. calcaratus, Lupinus laxiflorus var. cognatus, Lupinus laxiflorus var. elmerianus, Lupinus laxiflorus var. laxiflorus, Lupinus laxiflorus var. lyleianus, Lupinus laxiflorus var. pseudoparviflorus, Lupinus laxiflorus var. silvicola, Lupinus lyleianus, Lupinus mucronulatus var. umatillensis, Lupinus sulphureus var. applegatianus
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