Lupinus arboreus |
Lupinus affinis |
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coastal bush lupine, tree lupine, yellow bush lupine |
fleshy lupine |
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Habit | Shrubs, usually 5–20 dm, green-glabrous or silver-hairy. | Herbs, annual, 2–5 dm, pubescent. |
Stems | ascending or erect, branched, woody. |
ascending or erect, branched or unbranched. |
Leaves | cauline; stipules 8–12 mm; petiole 2–3(–6) cm; leaflets 5–12, blades 20–60 × 3–10 mm, adaxial surface glabrous. |
cauline; petiole 3–10 cm; leaflets 5–8, blades 20–50 × 4–11 mm, adaxial surface pubescent. |
Racemes | 10–30 cm; flowers whorled or not. |
10–40 cm; flowers whorled. |
Peduncles | 4–10 cm; bracts deciduous, 8–10 mm. |
5–18 cm; bracts deciduous, 5–7.5 mm. |
Pedicels | 4–10 mm. |
3–6 mm. |
Flowers | 14–18 mm; calyx bulge or spur 0–1 mm, abaxial lobe entire, 5–7 mm, adaxial lobe 2-toothed, 5–9 mm; corolla usually yellow, rarely lilac to purple, banner patch darker or not or white, banner glabrous abaxially, lower keel margins glabrous, adaxial margin ciliate from claw to tip. |
8–12 mm; calyx 5–7 mm, lobes ± equal, entire; corolla blue, banner spot white, upper keel margins with a tooth near middle, ciliate from tooth to near apex, banner width equal to or greater than length. |
Legumes | 4–7 cm, hairy. |
3–5 cm, coarsely pubescent. |
Cotyledons | deciduous, petiolate. |
deciduous, petiolate. |
Seeds | 8–12, black to tan, often striped lighter, 4–5 mm. |
5–8. |
2n | = 48. |
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Lupinus arboreus |
Lupinus affinis |
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Phenology | Flowering Apr–Jul. | Flowering late winter–spring. |
Habitat | Coastal bluffs, dunes, disturbed sand. | Uncommon in open areas. |
Elevation | 0–100 m. (0–300 ft.) | 0–800 m. (0–2600 ft.) |
Distribution |
CA; OR; WA; BC; Mexico (Baja California) [Introduced in South America (Argentina, Chile), Europe, Pacific Islands (New Zealand), Australia (including Tasmania)]
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CA; OR
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Discussion | Lupinus arboreus is known from the central California coast southward to northern Baja California; it was introduced as a sand binder and has become naturalized in northern California, Oregon, Washington, and southern British Columbia. Lupinus arboreus grades into L. rivularis in the North Coast of California. Plants with yellow petals and sweet-smelling flowers are widely cultivated as a sand binder. Hairier plants from the western San Francisco Bay area with yellow banners and blue wings have been called var. eximius; plants with glabrous leaflets and purple petals have been called L. propinquus. Lupinus arboreus hybridizes with L. littoralis and probably other species. Seeds of L. arboreus species are toxic. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Lupinus affinis is mostly a coastal species that occurs from the San Francisco Bay region northward to Lane County, Oregon. Lupinus affinis intergrades with L. nanus and can be confused with L. littoralis var. variicolor, a perennial species with a toothed keel. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Lupinus | Fabaceae > subfam. Faboideae > Lupinus |
Sibling taxa | ||
Synonyms | L. arboreus var. eximius, L. propinquus | L. affinis var. carnosulus, L. carnosulus, L. nanus var. carnosulus |
Name authority | Sims: Bot. Mag. 18: plate 682. (1803) | J. Agardh: Syn. Lupini, 20. (1835) |
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