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tree lupine, yellow bush lupine

chick lupine

Habit Plants perennial, 10–20 dm. Plants annual, 1–5(7) dm.
Stems

ascending to erect; woody, obscurely to slightly pubescent.

decumbent to erect, 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.

mostly sub-basal;

leaflets (5)7–11, 10–60 × 2–12 mm, linear-elliptic to oblanceolate or obovate;

tips rounded to acute, often apiculate;

surfaces abaxially sparsely villous, adaxially glabrous;

petioles 25–119 mm.

Inflorescences

(4.5)7.5–21 cm;

peduncles (3)5–11.5 cm;

pedicels 5–11 mm.

(2)4–12(20) cm;

peduncles 4–10.5 cm;

pedicels 1–3 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.

calyces (6.5)7.5–17 mm, not spurred;

lips unequal;

corollas 0.9–1.7 cm, purple to lilac, sometimes pink or pink-purple;

banners cup type; spot absent.

Fruits

(20)30–70 mm, villous.

10–16(20) mm, sericeous.

Seeds

2–8.

2–3.

Lupinus arboreus

Lupinus microcarpus

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch 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.

Disturbed areas, roadsides, meadows, chaparral, sagebrush. Flowering May–Jul. 300–1700 m. BR, ECas, Lava, Owy, Sisk. CA, WA; north to British Columbia; Chile. Native.

Source Flora of Oregon, volume 2, page 699
Paul Severns, Stephen Meyers, Christopher Royce
Flora of Oregon, volume 2, page 703
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
L. affinis, L. albicaulis, L. albifrons, L. arboreus, 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. nevadensis, L. onustus, L. oreganus, L. polyphyllus, L. pusillus, L. rivularis, L. sabinianus, L. sericeus, L. sulphureus, L. tracyi, L. uncialis
Synonyms Lupinus densiflorus var. densiflorus, Lupinus microcarpus var. microcarpus, Lupinus subvexus var. transmontanus
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