Eriophorum brachyantherum
close-sheath cotton-grass, closed-sheath cotton-grass, linaigrette à anthères courtes, northland cottonsedge, short-anther cotton-grass
terete or nearly so, 20–70 cm, smooth.
bladeless sheaths 1–3, evenly distributed on culm, distal to middle, not inflated distally, filiform, channeled, 0.4–1.2 mm wide.
involucral bracts absent.
solitary, erect, globose, 10–20 mm in flower, 20–35 mm in fruit;
proximal empty scales usually 7 or more, ascending, blackish, ovate-lanceolate, 5–10 mm, thin, margins broad, ribless, midrib not reaching tip.
perianth bristles usually more than 8, creamy white to pale brown, 10–20 mm;
anthers 0.5–2 mm.
oblanceoloid, (1.8–)2–2.3(–2.7) × 0.5–1.2 mm;
apex minutely apiculate, 0.1 mm.
= 58.
Eriophorum brachyantherum
Eriophorum brachyantherum var. pellucidum Lepage is ca. 30 cm with narrowly oblong achenes (2.5–2.7 mm). It is known from only a single station (Rupert House, Quebec) and may be a hybrid between E. brachyantherum and E. vaginatum subsp. spissum. Further study is needed to determine the status of this plant.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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