Monographs Details: Carex x mainensis Britton
Authority: Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Description:Species Description - Stems slender, 3–8 dm, tufted, often on a short stout rhizome; lvs 2–3 mm wide, long-attenuate and conspicuously involute; staminate spike solitary, or often with a much smaller second one at its base; pistillate spikes 1–3, well separated, cylindric, 1–3 cm × 6–8 mm; pistillate scales brownish, narrower and considerably shorter than the perigynia; perigynia ovoid or oblong-ovoid, 3.5–5 mm, scarcely inflated, only faintly nerved (except the marginal ribs), the beak 0.5–1 mm, emarginate, its broadly triangular teeth 0.25 mm. Beaches and streambanks; Me. to Nf. and Lab. Thought to be a hybrid of no. 214 [Carex saxatilis L.]and some other sp. of this group.