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FNA | Family List | FNA Vol. 23 | Cyperaceae | Carex

26aaa. CAREX Linnaeus sect. LEUCOGLOCHIN Dumortier, Fl. Belg. 146. 1827.

Theodore S. Cochrane

Carex sect. Orthocerates Koch

Plants cespitose or not, short to long rhizomatous. Culms pale brown at base. Leaves: basal sheaths not fibrous; sheath fronts membranous; blades V-shaped in cross section when young, glabrous. Inflorescence 1 spike per culm; bracts absent; spike androgynous. Proximal pistillate scales soon deciduous, less than 10 mm, shorter than perigynium, apex obtuse or subacute. Perigynia at first erect, becoming deflexed, obscurely veined, very obliquely substipitate, lance-subulate to narrowly elongate-oblong, almost round in cross section, base tapered and spongy, apex tapering gradually to beak, glabrous; beak less than 2 mm, orifice truncate. Stigmas 3. Achenes narrowly oblong or narrowly oblong-lanceoloid, trigonous with sides concave proximally, much smaller than bodies of perigynia; style persistent.

Species 5 or 6 (2 in the flora): widespread in arctic, boreal, and alpine regions of North America and Eurasia, w and s South America, c Asia.

Members of Carex sect. Leucoglochin are further characterized by pistillate scales that fall very early.

1 Perigynia 3.4–4.7 mm (excluding rachilla); rachilla exserted 0.5–2.8 mm from orifice of beak, exceeding style, style not exserted; pistillate scales (except the proximal) 2.4–3 mm; proximal leaves blade-bearing.   420 Carex microglochin
+ Perigynia (5–)5.9–7.8 mm; rachilla vestigial, style exserted; pistillate scales 3.7–5.9 mm; proximal leaves bladeless.   421 Carex pauciflora

Lower Taxa


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