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dense cotton-grass, linaigrette de scheuchzer, scheuchzer's cotton-grass, shealted cotton-grass, white cotton-grass, white cottonsedge

Habit Plants colonial from long-creeping rhizomes.
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.

Leaves

blades channeled or strongly involute, 3–12 cm;

distal leaves usually bladeless with black-tipped sheath.

Inflorescences

involucre absent.

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.

Flowers

perianth bristles 10 or more, bright white, sometimes red-tinged, 15–30 mm, smooth;

anthers 0.5–1.5 mm.

Achenes

narrowly oblong, 0.4–2.5 mm, apex with subulate beak.

2n

= 58.

Eriophorum scheuchzeri

Phenology Fruiting summer.
Habitat Tundra, wet peat, marshy ground, peaty soils, riverbanks, lake and pond shores
Elevation 0–3000 m (0–9800 ft)
Distribution
from FNA
AK; CO; MT; UT; WA; WY; AB; BC; NL; NT; NU; ON; QC; SK; YT; Greenland; Eurasia
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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.)

Source FNA vol. 23, p. 25.
Parent taxa Cyperaceae > Eriophorum
Sibling taxa
E. angustifolium, E. brachyantherum, E. callitrix, E. chamissonis, E. crinigerum, E. gracile, E. tenellum, E. vaginatum, E. virginicum, E. viridicarinatum
Synonyms E. altaicum, E. capitatum, E. scheuchzeri var. tenuifolium
Name authority Hoppe: Bot. Taschenb. 1800: 104, plate 7. (1800)
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