Thermopsis montana |
Thermopsis divaricarpa |
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golden banner, golden pea, mountain buck-bean, mountain golden-banner, mountain golden-pea, mountain thermopsis |
pine goldenpea, spreadfruit goldenbanner |
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Habit | Herbs delicate, 2–8(–10) dm, glabrate, appressed-pubescent, or thinly villous. | Herbs delicate, 3–6(–9) dm, glabrate or puberulent. | ||||
Stems | slender, erect, solitary or clustered, moderately or few-branched, from woody rootstock or rhizomes; branches ascending at 20–45º, weakly or moderately zigzag. |
slender, erect, clustered, several-branched, from thick woody rootstock or rhizomes; branches ascending at 20–35º, weakly to moderately or 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, ovate to narrowly elliptic, 2–3.5(–4) × 0.7–3 cm, base cuneate to cordate, apex acute; petiole 1–2.5 cm; leaflet blades elliptic to narrowly elliptic or rhombic, 3–7 × 0.5–2.5 cm, lateral veins 7–10 pairs, conspicuously net-veined abaxially, apex acute to obtuse, surfaces glabrate to puberulent. |
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Racemes | 6–25-flowered, 4–25 cm; flowers in whorls of 2 or 3 or scattered. |
5–15-flowered, 7–15 cm; flowers usually in whorls of 2–4. |
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Peduncles | 2–8 cm; bracts semipersistent, narrowly elliptic or elliptic to widely ovate, 6–10 × 2.5–6 mm. |
3–5 cm; bracts deciduous, ovate to lanceolate, 7–14 × 3–5 mm. |
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Pedicels | 3.5–5 mm, villosulous. |
5–8 mm, glabrate to puberulent. |
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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. |
2.5–2.9 cm; calyx 8–11 × 6–8 mm at limb, lobes 2–5 mm, equal to or shorter than tube; wing and keel petals elliptic to asymmetrically oblong-elliptic; ovary appressed-pubescent; ovules 10–18. |
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Legumes | ascending, straight, 4.5–6.5 × 0.4–0.6 cm, villosulous or appressed-pubescent. |
divergent, straight to arcuate, to ca. 45º, 6.5–9 × 0.6–0.8 cm, inconspicuously appressed-pubescent. |
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Seeds | 6–16, brown-black, oblong, 3.5–5 × 2.5–3 mm, beaked. |
(6–)10–14, brown-black, elliptic, 4–5 × 2–2.5 mm, beaked. |
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2n | = 36. |
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Thermopsis montana |
Thermopsis divaricarpa |
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Phenology | Flowering (Apr–)May–Jun(–Jul). | |||||
Habitat | Pine or spruce forests, streamsides, moist, open areas. | |||||
Elevation | 2000–3000 m. (6600–9800 ft.) | |||||
Distribution |
North America
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CO; NM; WY
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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.) |
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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 | T. rhombifolia var. divaricarpa | ||||
Name authority | Nuttall in J. Torrey and A. Gray: Fl. N. Amer. 1: 388. (1840) | A. Nelson: Bot. Gaz. 25: 275, plate 18, fig. 3. (1898) | ||||
Web links |