Eriophorum scheuchzeri |
Eriophorum gracile |
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dense cotton-grass, linaigrette de scheuchzer, scheuchzer's cotton-grass, shealted cotton-grass, white cotton-grass, white cottonsedge |
linaigrette grêle, slender cotton-grass, slender cottonsedge |
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Habit | Plants colonial from long-creeping rhizomes. | 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. |
20–60 cm × 0.5–0.8 mm, distally smooth. |
Leaves | blades channeled or strongly involute, 3–12 cm; distal leaves usually bladeless with black-tipped sheath. |
blades trigonous-channeled in cross section, to 30 cm × 1–2 mm; distal leaf blade 1–4 cm × 1–1.5 mm, shorter than its 3.5–5.5 cm sheath. |
Inflorescences | involucre absent. |
blade-bearing involucral bracts solitary, similar to distal leaf, blade usually gray or black proximally, 0.6–2 cm. |
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. |
(1–)2–5, in subumbels, narrowly ovoid, 7–10 mm in flower, 15–25 mm in fruit; peduncles 5–30 mm, scabrous; scales black or dark gray with black tip, broadly ovate, 3–4 mm, scarious, margins absent or to 0.1 mm wide, 5–9-ribbed, midrib prominent, usually dilated distally, reaching tip, apex obtuse-subacute. |
Flowers | perianth bristles 10 or more, bright white, sometimes red-tinged, 15–30 mm, smooth; anthers 0.5–1.5 mm. |
perianth bristles 10 or more, white, 10–15 mm, smooth; anthers 1–2.5 mm. |
Achenes | narrowly oblong, 0.4–2.5 mm, apex with subulate beak. |
narrowly obovoid, 1.5–3 mm. |
2n | = 58. |
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Eriophorum scheuchzeri |
Eriophorum gracile |
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Phenology | Fruiting summer. | Fruiting late spring–mid summer. |
Habitat | Tundra, wet peat, marshy ground, peaty soils, riverbanks, lake and pond shores | Meadows, bogs, shores, usually peaty, acidic substrates |
Elevation | 0–3000 m (0–9800 ft) | 0–4000 m (0–13100 ft) |
Distribution |
AK; CO; MT; UT; WA; WY; AB; BC; NL; NT; NU; ON; QC; SK; YT; Greenland; Eurasia
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AK; CA; CO; CT; DE; ID; IL; IN; MA; ME; MI; MN; MT; NH; NJ; NV; NY; OH; OR; PA; RI; UT; VT; WA; WI; WY; AB; BC; MB; NB; NL; NS; NT; NU; ON; PE; QC; SK; SPM; 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.) |
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Source | FNA vol. 23, p. 25. | FNA vol. 23, p. 25. |
Parent taxa | Cyperaceae > Eriophorum | Cyperaceae > Eriophorum |
Sibling taxa | ||
Synonyms | E. altaicum, E. capitatum, E. scheuchzeri var. tenuifolium | |
Name authority | Hoppe: Bot. Taschenb. 1800: 104, plate 7. (1800) | W. D. J. Koch ex Roth: Catal. Bot. 2: 259. (1800) |
Web links |
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