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russet cottongrass

Culms

somewhat trigonous; (20)30–70(80) cm; stout; to 1.5(4) mm thick basally.

Leaves

blades filiform, trigonous-channeled; (2)3–10 cm × 1–2 mm;

distal 1–2 leaf sheaths bladeless.

Inflorescences

involucral bracts absent.

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.

Flowers

perianth bristles 20–40 mm, red-brown to white;

anthers (0.6)1.5–3 mm.

Achenes

oblong-obovoid, 2–2.7 mm; as wide as long.

2n

=58.

Eriophorum chamissonis

Eriophorum tenellum

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
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.

Source Flora of Oregon, volume 1, page 244
Barbara Wilson, Richard Brainerd, Nick Otting
Sibling taxa
E. angustifolium, E. gracile
E. angustifolium, E. chamissonis, E. gracile
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