Lupinus microcarpus |
Lupinus rivularis |
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chick lupine, wide-bannered lupine |
river-bank lupine, stream bank lupine |
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Habit | Herbs, annual, 1–8 dm, sparsely to densely pubescent. | Herbs, perennial, 3.5–10 dm, green, ± glabrous. | ||||||||
Stems | ascending or erect, branched near base or middle, or unbranched, hollow, at least near base. |
decumbent, ascending, or erect, branched, dark brown to red, usually hollow. |
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Leaves | cauline; petiole 3–15 cm; leaflets 5–9(–11), blades 10–50 × 2–12 mm, adaxial surface glabrous. |
cauline; stipules 7–15 mm; petiole 3–5 cm; leaflets 5–9, blades 20–40 × 4–9 mm, adaxial surface glabrous. |
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Racemes | 4–60 cm; flowers in crowded to widely spaced whorls. |
open, 15–50 cm; flowers ± whorled or not. |
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Peduncles | 2–30 cm; bracts persistent, reflexed, 3.5–12 mm. |
3–15 cm; bracts deciduous, 8–10 mm. |
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Pedicels | 0.5–5 mm. |
5–10 mm. |
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Flowers | 8–18 mm; calyx appendages usually absent, sometimes present, abaxial lobe 5–11 mm, adaxial lobe 2–6 mm; corolla white to dark yellow, pink to dark rose, or lavender to purple, lower wing margins sometimes ciliate, upper margins usually ciliate near claw, upper keel margins usually ciliate near claw, lower margins sometimes ciliate but not as densely. |
12–16 mm; calyx bulge or spur 0–1 mm, abaxial lobe entire or ± 3-toothed, 7–9 mm, adaxial lobe 2-toothed, 7–8 mm; corolla violet, banner glabrous abaxially, lower keel margins glabrous, adaxial margin ciliate claw to tip. |
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Legumes | 1–1.8 cm, pubescent. |
dark, 3–7 cm, sparsely hairy. |
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Cotyledons | persistent or deciduous (leaving circular scar), disclike, sessile. |
deciduous, petiolate. |
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Seeds | 2, tan to brown, usually mottled, ridged or smooth. |
7 or 8, mottled brown with black line, 3–4 mm. |
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Lupinus microcarpus |
Lupinus rivularis |
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Phenology | Flowering Mar–Jun. | |||||||||
Habitat | Gravelly prairies, open woods, riverbanks. | |||||||||
Elevation | 0–500 m. (0–1600 ft.) | |||||||||
Distribution |
w North America; nw Mexico; South America
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CA; OR; WA; BC
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Discussion | Varieties 3 (3 in the flora). Lupinus microcarpus is highly variable and with varieties intergrading. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Lupinus rivularis ranges from Mendocino County in California northward through Oregon and Washington. It has been confirmed in British Columbia (where it is of conservation concern) in the extreme southwestern corner of the province, with a single population on southern Vancouver Island and five populations in the lower Fraser Valley. Lupinus rivularis is distinguished by its absence of wood, banners that are glabrous abaxially, ciliate keels, glabrous leaf surfaces, and violet flowers. It grades into blue-flowered L. arboreus but blooms earlier (late winter, spring) and is not sweet-smelling. L. L. Phillips (1955) considered L. rivularis as synonymous with L. albicaulis. Lupinus rivularis is widely planted for erosion control in western Oregon; it is of conservation concern in Canada. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 11. | FNA vol. 11. | ||||||||
Parent taxa | Fabaceae > subfam. Faboideae > Lupinus | Fabaceae > subfam. Faboideae > Lupinus | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | L. amphibius, L. lignipes | |||||||||
Name authority | Sims: Bot. Mag. 50: plate 2413. (1823) | Douglas ex Lindley: Edwards’s Bot. Reg. 19: plate 1595. (1833) | ||||||||
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