Trichophorum alpinum |
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alpine bulrush, alpine clubsedge, Hudson bay clubrush, silken clubrush, trichophore des alpes |
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Habit | Plants densely cespitose; rhizomes arching, short. |
Culms | trigonous, 10–40 cm, scabrous proximal to inflorescence. |
Leaves | basal sheaths gray-brown; distal leaf sheaths concave at mouth; blades 6–9 × 0.4–0.5 mm, much shorter than culms at flowering and fruiting. |
Inflorescences | spikelets 15–20-flowered, 5.4–8 × 2.2–3.5 mm; bracts equaling or shorter than spikelets, 4.5–7.8 mm, apex mucronate or awned, awn to 3 mm. |
Spikelets | scales yellow-brown, apex obtuse. |
Flowers | perianth bristles 6, white, flattened, exceeding achenes by as much as 20 times, smooth; anthers 1.1–1.6 mm. |
Achenes | plano-convex, 1.2–1.6 × 0.5–0.8 mm. |
2n | = 58. |
Trichophorum alpinum |
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Phenology | Fruiting summer (Jun–Aug). |
Habitat | Open or shaded, wet, peaty or gravelly fens, bogs, sheltered banks of lakes, ponds, and streams, tending to occur on lime-rich substrates |
Elevation | 0–1400 m (0–4600 ft) |
Distribution |
AK; CT; MA; ME; MI; MN; MT; NH; NJ; NY; VT; WI; AB; BC; MB; NB; NL; NS; NT; NU; ON; QC; SK; YT; Europe; c Asia (Kamchatka)
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Source | FNA vol. 23, p. 31. |
Parent taxa | Cyperaceae > Trichophorum |
Sibling taxa | |
Synonyms | Eriophorum alpinum, Eriophorum hudsonianum, Scirpus alpinus, Scirpus hudsonianus, T. alpinum var. hudsonianum |
Name authority | (Linnaeus) Persoon: Syn. Pl. 1: 70. (1805) |
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