Carex backii Boott

Back's sedge (en)

Species

Angiosperms > Poales > Cyperaceae > Carex

Characteristics

Culms 1.4–25 cm. Leaves: basal sheaths pale to medium brown; blades dull green to yellowish green, longer than stems, 1.3–5.4 mm wide, coriaceous, margins green, crenulate to scabrous. Lateral spikes 0–3, basal, on erect peduncles. Terminal spikes with staminate portion 2–3-flowered, 2-–3.6 × 0.4–1 mm; pistillate portion 2–7-flowered. Pistillate scales green, margins (2–)2.5–6.5 mm wide, essentially concealing perigynia, apex acute, distal scales lanceolate to ovate, apex acute. Staminate scales green to pale brown, ovate to oblong, 1.9–3.5 × 0.8–1.5 mm, margins enfolding scales above, white, often with reddish brown tinge, apex obtuse. Anthers 0.9–1.3 mm. Perigynia dull green to dark olive green, ellipsoid to ovoid, 4.8–6.6 × 1.9–3.2 mm, loosely enveloping achenes, apex gradually tapering; beak 1.9–2.9 mm, smooth. Stigmas clavate, erect, shorth, thick, minutely papillose. Achenes 2.5–3.2 × 1.6–2.3 mm. 2n = 66.
More
Much like no. 90 [Carex willdenowii Willd.]; main lvs 3–6 mm wide; staminate scales ca 3, the margins connate to above the middle; pistillate scales wholly green, wider than and nearly concealing the perigynia, the lower elongate and lf-like, (1.5–)2–7 cm, the upper progressively reduced but still surpassing the perigynia; perigynia 2–5, turgid, rounded-trigonous, inconspicuously nerved, 4–5.4 mm, rhombic-ovoid and obscurely beaked to subglobose or obovoid and with a conspicuous, smooth or obscurely serrulate beak to 2 mm; achene without a stylar apiculus; 2n=66. Woods and thickets; Que. to N.J., w. across the n. states to Minn., Neb., B.C., Oreg., and Utah. (C. durifolia; C. saximontana)
Life form perennial
Growth form herb
Growth support free-standing
Foliage retention deciduous
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Mature height (meter) 0.05 - 0.25
Root system fibrous-root
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Hardiness (USDA) 4-9

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Cultivation

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Images

Carex backii unspecified picture

Distribution

Carex backii world distribution map, present in Canada, Colombia, Micronesia (Federated States of), and United States of America

Identifiers

LSID urn:lsid:ipni.org:names:298749-1
WFO ID wfo-0000344797
COL ID R88T
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR) Link

Synonyms

Carex backii Carex durifolia Carex backii var. backii