Perennial herb from long rhizomes; stems nearly round in cross-section, tapered, smooth, easily crushed between the fingers, 50-200 cm tall or more.
All near the base of the stems, few, to about 1/2 the length of the stems; sheaths brown to straw-coloured or mottled brownish, reddish near the base; blades usually lacking or 1 or 2, if present, C-shaped to flattened top to bottom, much shorter than the sheaths, the margins often minutely rough.
Spikes several to numerous, terminal, reddish-brown, 5-12 mm long, in unstalked clusters in a branching inflorescence, or some of them borne singly in compound, compact to open clusters, the branches of the inflorescence lax, sometimes drooping; involucral bracts solitary, rarely more, erect, reduced, not leaflike, thickly C-shaped to nearly circular in cross-section, tapered, with sometimes minutely rough margins, to as much as 7 cm long, appearing like an extension of the stem.
Scales brown to purplish-brown, with numerous, short, red-brown linear marks, (2) 2.5-3 (3.5) mm long, smooth, egg-shaped, the margins entire to somewhat irregular or jagged or short-fringed and short-awned; perianth bristles 6, brown, about equalling to surpassing the achenes; achenes plano-convex, mostly 2-2.3 mm long, not completely concealed by the scales at maturity, abruptly sharp-pointed.
If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.
Illustration Source: The Illustrated Flora of British Columbia
Present over the Summer
Source: The USDA
||Value / Class
Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
of field plots
species was recorded in:
BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in
|BG(13), BWBS(2), CWH(3), ICH(9), IDF(46), MS(9), PP(11), SBPS(1), SBS(1)|
Source: Klinkenberg 2013
Synonyms and Alternate Names:
Schoenoplectus lacustris subsp. creber (Fern.) A.& D. L÷ve
Schoenoplectus lacustris subsp. tabernaemontani (K. C. Gmel.) A.& D. L÷ve
Schoenoplectus lacustris subsp. validus (Vahl) T. Koyama
Schoenoplectus validus (Vahl) A. L÷ve & D. L÷ve
Schoenoplectus validus subsp. creber (Fernald) A. L÷ve & D. L÷ve
Schoenoplectus validus subsp. luxurians (Miq.) Sojßk
Scirpus lacustris subsp. creber (Fern.) T. Koyama
Scirpus lacustris subsp. glaucus (Rchb.) Hartm.
Scirpus lacustris subsp. tabernaemontani (K.C. Gmel.) Syme
Scirpus lacustris subsp. validus (Vahl) T. Koyama
Scirpus lacustris subsp. validus
Scirpus tabernaemontani C.C. Gmel.
Scirpus validus Vahl
Scirpus validus var. creber Fern.