Lupinus lepidus |
Lupinus lepidus var. lepidus |
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Donner Lake lupine, dwarf lupine, Lobb's lupine, Pacific lupine, prairie lupine, prostrate lupine, stool lupine, tidy lupine |
dwarf lupine, Pacific lupine |
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Habit | Herbs, perennial, less than 6 dm, matted, hairy. | Herbs 20–40 cm, sericeous. | ||||||||||||||||||||||||||||||||||||||
Stems | acaulescent or prostrate to ± erect, unbranched or branched. |
erect. |
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Leaves | usually basal, sometimes cauline present; stipules 3–25 mm; petiole 2–13 cm; leaflets 5–8, blades 5–40 × 3–7 mm, surfaces pubescent. |
usually basal; leaflet blades 5–40 × 3–7 mm, adaxial surface pubescent. |
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Racemes | dense, 3–20 cm, not exceeding to exserted beyond leaves; flowers whorled, usually crowded. |
8–13 cm, exserted beyond leaves, ± dense, flowers whorled. |
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Peduncles | 2–13 cm; bracts usually persistent, 4–15 mm. |
(2–)4.5–13 cm; bracts persistent, 4–15 mm. |
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Pedicels | 0.4–3 mm. |
1–3 mm. |
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Flowers | 6–13 mm; calyx bulge or spur 0–1 mm, abaxial lobe entire or 3-toothed, 4–7 mm, adaxial lobe entire or 2-toothed, 3–7 mm; corolla pink, violet, or blue, banner glabrous abaxially, lower keel margins glabrous, adaxial margin ciliate. |
in 9–11 whorls, 10–14 mm; corolla blue. |
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Legumes | 1–2 cm, hairy. |
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Cotyledons | deciduous, petiolate. |
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Seeds | 2–6, ± mottled tan or green to brown, 2–4 mm. |
3–6, 2–3 mm. |
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Lupinus lepidus |
Lupinus lepidus var. lepidus |
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Phenology | Flowering Apr–Jul. | |||||||||||||||||||||||||||||||||||||||
Habitat | Open prairies, in sandy, gravelly soils. | |||||||||||||||||||||||||||||||||||||||
Elevation | 30–500 m. (100–1600 ft.) | |||||||||||||||||||||||||||||||||||||||
Distribution |
w North America
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AK; OR; WA; AB; BC |
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Discussion | Varieties 10 (10 in the flora). Dwarf perennial lupines are usually characterized by a cespitose habit, persistent inflorescence bracts, banners that are glabrous abaxially, and ciliate keel petals. The history of the taxonomy of this group was discussed in detail by B. J. Cox (1972), R. C. Barneby (1989), and K. A. Weitemier (2010). Barneby gave justification for his conservative treatment of this taxon, which is generally followed here. Genetic analysis in lupines has shown little separation, according to Weitemier, but he suggested that there is good evidence to retain these variations as varieties, following Barneby, rather than elevating them to species level. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Variety lepidus was historically present throughout much of the Willamette Valley; it has been extirpated from much of its range and is probably now only present in Oregon at a few sites (K. A. Weitemier 2010). (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 > Lupinus lepidus | ||||||||||||||||||||||||||||||||||||||
Sibling taxa | ||||||||||||||||||||||||||||||||||||||||
Subordinate taxa | ||||||||||||||||||||||||||||||||||||||||
Synonyms | L. minimus | |||||||||||||||||||||||||||||||||||||||
Name authority | Douglas ex Lindley: Bot. Reg. 14: plate 1149. (1828) | unknown | ||||||||||||||||||||||||||||||||||||||
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