Thermopsis montana |
Thermopsis mollis |
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golden banner, golden pea, mountain buck-bean, mountain golden-banner, mountain golden-pea, mountain thermopsis |
Allegheny Mountain goldenbanner |
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Habit | Herbs delicate, 2–8(–10) dm, glabrate, appressed-pubescent, or thinly villous. | Herbs delicate, 3–6 dm, 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. |
slender, ascending or spreading, solitary or clustered, several-branched, from extensive rhizomes; branches spreading at 45–80º, 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 caducous, narrowly elliptic to linear, 1.5–2 × 0.3–0.5(–0.8) cm, base cuneate, apex acuminate; petiole 0.7–1.7 cm; leaflet blades elliptic, 3.5–8 × 1–4 cm, lateral veins 7–9 pairs, conspicuously net-veined abaxially, apex acute to acuminate, surfaces sparsely appressed-pubescent (especially on veins), sometimes glabrate adaxially. |
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Racemes | 6–25-flowered, 4–25 cm; flowers in whorls of 2 or 3 or scattered. |
terminal, 5–17-flowered, 7–20 cm; flowers scattered. |
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Peduncles | 2–8 cm; bracts semipersistent, narrowly elliptic or elliptic to widely ovate, 6–10 × 2.5–6 mm. |
3–7 cm; bracts persistent, lanceolate, 8–13 × 2–4 mm. |
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Pedicels | 3.5–5 mm, villosulous. |
4–6 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. |
1.6–1.9 cm; calyx 7.5–8 × 6–7 mm at limb, lobes 2–3 mm, shorter than tube; wing petals elliptic to asymmetrically oblong-elliptic, keel petals asymmetrically oblong-elliptic; ovary densely appressed-pubescent; ovules (8–)12–16. |
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Legumes | ascending, straight, 4.5–6.5 × 0.4–0.6 cm, villosulous or appressed-pubescent. |
divaricate, arcuate to straight, (3–)4–9 × 0.4–0.6 cm, densely appressed-pubescent. |
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Seeds | 6–16, brown-black, oblong, 3.5–5 × 2.5–3 mm, beaked. |
6–12, tan to brown-black, oblong, 2.5–3.5 × 1.5–2 mm, beaked. |
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2n | = 18. |
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Thermopsis montana |
Thermopsis mollis |
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Phenology | Flowering (Apr–)May–Jun. | |||||
Habitat | Rich, sandy, dry woods and ridges. | |||||
Elevation | 300–800 m. (1000–2600 ft.) | |||||
Distribution |
North America
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AL; GA; KY; NC; SC; TN; VA |
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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 | Podalyria mollis, T. hugeri | ||||
Name authority | Nuttall in J. Torrey and A. Gray: Fl. N. Amer. 1: 388. (1840) | (Michaux) M. A. Curtis: Mem. Amer. Acad. Arts, n. s. 3: 47. (1846) | ||||
Web links |