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FNA Vol. 23 Page 380, 382, 383, 384, 385, 388, 389, 390, 394, 395,
397
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197.
Carex aquatilis
Wahlenberg, Kongl. Vetensk. Acad. Nya Handl. 24: 165. 1803.
Plants not cespitose. Culms 20—150 cm. Leaves: basal sheaths red-brown or brown; sheaths of proximal leaves glabrous, fronts with indistinct spots, veinless, apex U-shaped; blades usually amphi-stomic, papillose on both surfaces. Inflorescences: proximal bract longer than inflorescence. Spikes: erect; proximal 2—6 spikes pistillate; terminal (1—)2—4 spikes staminate. Pistillate scales red-brown to purple-brown, apex obtuse or acute, awnless. Perigynia ascending, veinless, somewhat flattened, loosely enclosing achenes, ellipsoid or obovoid, dull, apex obtuse or acute, papillose. Achenes not constricted, glossy. 2n = 72—80.
Varieties 4 (4 in the flora): North America, Europe.
Carex aquatilis is circumboreal and variable; four extensively intergrading varieties are recognized in North America. The species is distinguished by amphistomic (epistomic in var. dives) papillose leaves, glabrous sheaths with a concave apex, perigynia that lack veins and are usually brown-spotted on the proximal half, and have glossy achenes.
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Updated: 2024-04-26 01:17:19 gmt
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