Eriophorum angustifolium |
Eriophorum virginicum |
|||||
---|---|---|---|---|---|---|
many-spike bog cotton, many-spike cotton-grass, narrow-leaf cotton-grass, tall cottongrass, tall cottonsedge |
awny cottongrass, linaigrette de virginie, tawny cotton-grass, tawny cottonsedge |
|||||
Habit | Plants colonial from long-creeping rhizomes. | Plants colonial from long-creeping rhizomes. | ||||
Culms | to 100 cm × (0.8–)1–1.2 mm distally. |
40–120 cm × 0.6–1 mm, smooth or scabrous distally. |
||||
Leaves | blades flat, tip trigonous, channeled in cross section, to 40 cm × 1.5–6(–8) mm; distal leaf blade much longer than sheath. |
blades flat, trigonous in cross section distally, to 30 cm × 1.5–4 mm; distal leaf blade much longer than sheath. |
||||
Inflorescences | blade-bearing involucral bracts 1–3, proximally blade, often sheath black, leaflike, longest 1–12 cm. |
blade-bearing involucral bracts 2–5, sometimes brown-tinged proximally, leaflike, longest 4–12 cm. |
||||
Spikelets | (1–)2–10, in subumbels, patent or pendent, ovoid, 10–20 mm in flower, 20–50 mm in fruit; peduncles 5–60 mm, smooth or scabrous; scales lanceolate or ovate, 5–10 mm, with prominent midrib fading proximal to tip, apex ± acute; proximal scales without lateral ribs. |
2–10, usually in dense head, ovoid, 6–10 mm in flower, 10–20 mm in fruit; peduncles 2–10(–20) mm, scabrid; scales brown, often with green center, ovate-oblong, 4–5 mm, obscurely ribbed or with 3–5 equally prominent ribs, apex obtuse. |
||||
Flowers | perianth bristles 10 or more, white or pale yellow brown, 15–30 mm, smooth; anthers 2–5 mm. |
perianth bristles usually 10 or more, brown at least at base, rarely entirely white, 12–18 mm, smooth; anthers 0.7–1.5 mm. |
||||
Achenes | black, oblanceoloid, 2–5 mm. |
dark brown to black, narrowly obovoid or ellipsoid, 2.5–4 mm. |
||||
Eriophorum angustifolium |
Eriophorum virginicum |
|||||
Phenology | Fruiting mid summer–early fall. | |||||
Habitat | Bogs, meadows | |||||
Elevation | 0–1000 m (0–3300 ft) | |||||
Distribution |
AK; CO; IA; ID; IL; IN; ME; MI; MN; MT; ND; NE; NM; NY; OR; SD; UT; WA; WI; WY; AB; BC; MB; NB; NS; NT; NU; ON; PE; QC; SK; YT; n Eurasia
|
CT; DC; IL; IN; MA; MD; ME; MI; MN; NC; NH; NJ; NY; OH; PA; RI; SC; TN; VA; VT; WI; WV; NB; NL; NS; ON; PE; QC; SPM
|
||||
Discussion | eriophorum polystachion linnaeus is a rejected name Subspecies 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|||||
Key |
|
|||||
Source | FNA vol. 23, p. 23. | FNA vol. 23, p. 22. | ||||
Parent taxa | Cyperaceae > Eriophorum | Cyperaceae > Eriophorum | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Name authority | Honckeny: Verz. Gew. Teutschl., 153. (1782) | Linnaeus: Sp. Pl. 1: 52. (1753) | ||||
Web links |
|