Thermopsis montana |
Thermopsis montana var. ovata |
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golden banner, golden pea, mountain buck-bean, mountain golden-banner, mountain golden-pea, mountain thermopsis |
common thermopsis, slender goldenbanner |
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Habit | Herbs delicate, 2–8(–10) dm, glabrate, appressed-pubescent, or thinly villous. | Herbs 5–8(–10) dm, glabrate to sparsely appressed-pubescent. | ||||
Stems | slender, erect, solitary or clustered, moderately or few-branched, from woody rootstock or rhizomes; branches ascending at 20–45º, weakly or moderately zigzag. |
erect, clustered, several-branched, from woody rootstock; branches weakly to moderately 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. |
petiole 3.2–4 cm; leaflet blades broadly to narrowly elliptic or obovate, 4.5–6(–8) × 1.5–3(–5) cm, conspicuously net-veined abaxially, surfaces sparsely appressed-pubescent abaxially, glabrous adaxially. |
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Racemes | 6–25-flowered, 4–25 cm; flowers in whorls of 2 or 3 or scattered. |
12–25 cm; bracts narrowly elliptic. |
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Peduncles | 2–8 cm; bracts semipersistent, narrowly elliptic or elliptic to widely ovate, 6–10 × 2.5–6 mm. |
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Pedicels | 3.5–5 mm, villosulous. |
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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. |
1.9–2.2 cm. |
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Legumes | ascending, straight, 4.5–6.5 × 0.4–0.6 cm, villosulous or appressed-pubescent. |
appressed-pubescent. |
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Seeds | 6–16, brown-black, oblong, 3.5–5 × 2.5–3 mm, beaked. |
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Thermopsis montana |
Thermopsis montana var. ovata |
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Phenology | Flowering May–Jun. | |||||
Habitat | Moist soils, along streams and ditches, meadows, dry sagebrush plains. | |||||
Elevation | 10–2000 m. (0–6600 ft.) | |||||
Distribution |
North America
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ID; MT; OR; WA; NF; QC |
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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.) |
Variety ovata is distinguished from var. montana by having a relatively robust habit, several-branched stems, and broader leaflets and bracts. It is introduced in Newfoundland and Quebec. (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 > Thermopsis montana | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | T. rhombifolia var. montana | T. montana subsp. ovata, T. gracilis var. ovata, T. macrophylla var. hitchcockii, T. montana var. hitchcockii, T. rhombifolia var. ovata | ||||
Name authority | Nuttall in J. Torrey and A. Gray: Fl. N. Amer. 1: 388. (1840) | (B. L. Robinson ex Piper) H. St. John: Torreya 41: 112. (1941) | ||||
Web links |