Eriophorum scheuchzeri |
Eriophorum |
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dense cotton-grass, linaigrette de scheuchzer, scheuchzer's cotton-grass, shealted cotton-grass, white cotton-grass, white cottonsedge |
bog-cotton, cotton-grass, linaigrette |
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Habit | Plants colonial from long-creeping rhizomes. | Herbs, perennial, cespitose or not, rhizomatous. | ||||||||||||||||||||||||||||||||||||||||||||
Culms | solitary or few together, 5–35(–70) cm, usually not more than 1 mm diam. basally; basal sheaths persistent, brown or reddish, septate-nodulose. |
solitary or not, trigonous or terete. |
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Leaves | blades channeled or strongly involute, 3–12 cm; distal leaves usually bladeless with black-tipped sheath. |
basal and cauline; cauline leaves sometimes bladeless sheaths; ligules present; blades filiform to flat with filiform tip, to 25 cm × 2.5–4 mm. |
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Inflorescences | involucre absent. |
terminal, spikelets solitary, erect or (1–)2–10(–30) in subcapitate or subumbellate panicle; involucral bracts 1–several, scalelike or blade-bearing and leaflike throughout. |
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Spikelets | solitary, erect, broadly obovoid to subglobose in fruit, 8–12(–40) mm; scales gray to blackish green; proximal empty scales not more than 7, ovate, 4–10 mm, midrib not reaching tip; distal scales narrower, more attenuate, margins hyaline, not more than 1 mm wide. |
scales (10–)20–200, spirally arranged, each subtending flower, or proximal empty. |
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Flowers | perianth bristles 10 or more, bright white, sometimes red-tinged, 15–30 mm, smooth; anthers 0.5–1.5 mm. |
bisexual; perianth persistent, of (8–)10–25 hairlike, smooth bristles, or very rarely 6 antrorsely barbed bristles, greatly elongate, essentially straight, usually obscuring most of scales in spikelet, much longer than achene; stamens 1–3; styles deciduous, linear, 3-fid. |
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Achenes | narrowly oblong, 0.4–2.5 mm, apex with subulate beak. |
trigonous. |
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2n | = 58. |
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Eriophorum scheuchzeri |
Eriophorum |
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Phenology | Fruiting summer. | |||||||||||||||||||||||||||||||||||||||||||||
Habitat | Tundra, wet peat, marshy ground, peaty soils, riverbanks, lake and pond shores | |||||||||||||||||||||||||||||||||||||||||||||
Elevation | 0–3000 m (0–9800 ft) | |||||||||||||||||||||||||||||||||||||||||||||
Distribution |
AK; CO; MT; UT; WA; WY; AB; BC; NL; NT; NU; ON; QC; SK; YT; Greenland; Eurasia
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Mostly in cool temperate; alpine; and arctic regions of the Northern Hemisphere |
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Discussion | Eriophorum scheuchzeri var. tenuifolium Ohwi does not appear to be differentiated based on the North American specimens examined. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Species ca. 25 (11 in the flora). In some species the North American populations are considered to be conspecific with Eurasian populations; differences in achene micromorphology and isozyme data suggest that these relationships should be investigated more thoroughly. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 23, p. 25. | FNA vol. 23, p. 21. | ||||||||||||||||||||||||||||||||||||||||||||
Parent taxa | Cyperaceae > Eriophorum | Cyperaceae | ||||||||||||||||||||||||||||||||||||||||||||
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Synonyms | E. altaicum, E. capitatum, E. scheuchzeri var. tenuifolium | |||||||||||||||||||||||||||||||||||||||||||||
Name authority | Hoppe: Bot. Taschenb. 1800: 104, plate 7. (1800) | Linnaeus: Sp. Pl. 1: 52. (1753): Gen. Pl. ed. 5, 27. (1754) | ||||||||||||||||||||||||||||||||||||||||||||
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