Thermopsis montana |
Thermopsis robusta |
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golden banner, golden pea, mountain buck-bean, mountain golden-banner, mountain golden-pea, mountain thermopsis |
robust false-lupine, showy goldenbanner |
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Habit | Herbs delicate, 2–8(–10) dm, glabrate, appressed-pubescent, or thinly villous. | Herbs robust, 8–18 dm, densely tomentose. | ||||
Stems | slender, erect, solitary or clustered, moderately or few-branched, from woody rootstock or rhizomes; branches ascending at 20–45º, weakly or moderately zigzag. |
thick, erect, clustered, many-branched, from woody rootstock; branches ascending at 30–50º, strongly zigzag. |
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Leaves | stipules persistent, widely ovate or elliptic, 1.7–4.5 × 0.7–2.5 cm, base oblique to cuneate, apex acuminate or acute; petiole 1–4 cm; leaflet blades elliptic or obovate, 3.5–8 × 0.7–3(–5) cm, lateral veins 6–11 pairs, conspicuously net-veined abaxially or not, apex acute or obtuse, sometimes short-mucronate or emarginate, surfaces sparsely appressed-pubescent or glabrous. |
stipules persistent, widely ovate to nearly lanceolate, 1.5–5.5 × 0.7–3 cm, base oblique to cuneate, apex acuminate; petiole 2.2–3.5 cm; leaflet blades elliptic to widely elliptic or ovate, 6.5–11 × 2.5–6.5 cm, lateral veins 9–12 pairs, not conspicuously net-veined abaxially, apex acute to acuminate, short-mucronate, surfaces tomentose. |
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Racemes | 6–25-flowered, 4–25 cm; flowers in whorls of 2 or 3 or scattered. |
20–40-flowered, 20–45 cm; flowers in whorls of 2–5 or scattered. |
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Peduncles | 2–8 cm; bracts semipersistent, narrowly elliptic or elliptic to widely ovate, 6–10 × 2.5–6 mm. |
7–10 cm; bracts persistent, ovate, 8–14 × 3–8 mm. |
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Pedicels | 3.5–5 mm, villosulous. |
4–8 mm, densely tomentose. |
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Flowers | 1.6–2.2 cm; calyx 9–11 × 5–8 mm at limb, lobes 3–5 mm, shorter than tube; wings and keel petals asymmetrically oblong-elliptic; ovary velutinous or densely appressed-pubescent; ovules 10–16. |
1.6–1.8 cm; calyx 7–9 × 5–8 mm at limb, lobes 2–4 mm, equal to or shorter than tube; wing and keel petals asymmetrically oblong-rhombic; ovary densely tomentose; ovules 10–13. |
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Legumes | ascending, straight, 4.5–6.5 × 0.4–0.6 cm, villosulous or appressed-pubescent. |
divergent, arcuate, 4.5–6.5 × 0.4–0.5 cm, densely tomentose. |
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Seeds | 6–16, brown-black, oblong, 3.5–5 × 2.5–3 mm, beaked. |
5–10, brown, reniform, 3.5–4 × 2 mm, not beaked. |
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Thermopsis montana |
Thermopsis robusta |
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Phenology | Flowering May–Jun. | |||||
Habitat | Ridgetops. | |||||
Elevation | 150–1500 m. (500–4900 ft.) | |||||
Distribution |
North America
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CA |
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Discussion | Varieties 2 (2 in the flora). The strictly erect fruits distinguish Thermopsis montana from T. gracilis and from the superficially similar T. divaricarpa. Intermediate populations and possible hybrids are discussed under T. divaricarpa by C. J. Chen et al. (1994). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Thermopsis robusta is a localized, robust taxon known only from Humboldt and Siskiyou counties. (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 > Thermopsis | Fabaceae > subfam. Faboideae > Thermopsis | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | T. rhombifolia var. montana | |||||
Name authority | Nuttall in J. Torrey and A. Gray: Fl. N. Amer. 1: 388. (1840) | Howell: Erythea 1: 109. (1893) | ||||
Web links |