Eriophorum chamissonis |
Eriophorum gracile |
|
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russet cottongrass |
slender cottongrass |
|
Culms | somewhat trigonous; (20)30–70(80) cm; stout; to 1.5(4) mm thick basally. |
20–60 cm × 0.5–0.8 mm. |
Leaves | blades filiform, trigonous-channeled; (2)3–10 cm × 1–2 mm; distal 1–2 leaf sheaths bladeless. |
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 sheath. |
Inflorescences | involucral bracts absent. |
blade-bearing involucral bracts solitary, similar to distal leaf; blade usually gray or black proximally, 0.6–2 cm. |
Spikes | 1; floral scales blackish to purplish brown; proximal 1–7 scales empty, obovate or trigonous-obovate, 4–20 mm; margins white or paler; as wide as dark portion; apex blunt; distal scales obovate to ovate-lanceolate; margins hyaline, 1 mm wide or wider. |
(1)2–5; floral scales broadly ovate, 3–4.5 mm; black or dark gray with black tip; margins absent or to 0.1 mm wide, 5–9-ribbed; midrib reaching tip; apex obtuse to more or less acute. |
Flowers | perianth bristles 20–40 mm, red-brown to white; anthers (0.6)1.5–3 mm. |
perianth bristles 10–15 mm, white; anthers 1–2.5 mm. |
Achenes | oblong-obovoid, 2–2.7 mm; as wide as long. |
narrowly obovoid, 1.5–3 mm. |
2n | =58. |
|
Eriophorum chamissonis |
Eriophorum gracile |
|
Distribution | ||
Discussion | Coastal bogs and marshes. 0–50 m. Est. ID, WA; north to AK, east to WI, southeast to CO; Eurasia. Native. Eriophorum chamissonis is a lovely plant with large, shiny, dense heads of long, red-brown or bronze hairs. |
Meadows, bogs, shores, usually peaty, acidic substrates. 900–1800 m. BW, Casc, ECas, Est, WV. CA, ID, NV, WA; north to Alaska, east to Newfoundland and DE, southeast to CO; Eurasia. Native. |
Source | Flora of Oregon, volume 1, page 244 Barbara Wilson, Richard Brainerd, Nick Otting |
Flora of Oregon, volume 1, page 245 Barbara Wilson, Richard Brainerd, Nick Otting |
Sibling taxa | ||
Web links |
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