Schoenoplectus etuberculatus
Cas. Nár. Mus., Odd. Prír. 140: 127. 1972.
Plants mat-forming; rhizomes 1–3 mm diam. Culms proximally bluntly and distally sharply trigonous, 0.6–2 m × 3–5 mm. Leaves 5–20+, nearly equaling culm; sheath fronts delicately pinnate-fibrillose; blades 2–6+, smooth; distal blade longer than sheath, 2–10 mm wide, smooth; emergent blades stiff, cross section thickly V-shaped to trigonous near ligule, central region acutely trigonous and laterally flattened, distal region laterally flattened, apex often asymmetric; submerged blades often flaccid, ribbonlike. Inflorescences 2–3 times branched, 2–3 proximal internodes elongated, branches to 16 cm; proximal bract erect, resembling emergent leaf blade, 7–32 cm. Spikelets 3–20, 10–25 × 5–6 mm; scales straw-colored to orange-brown or flanks red, central region usually greenish, aging brown, ovate-lanceolate, 5–7 × 3 mm, smooth, margins sometimes ciliolate at 40X, apex acute, entire, mucro to 0.2 mm. Flowers: perianth bristles 6, medium brown to reddish, equaling achene, sparsely spinulose; anthers 3–3.5 mm; styles 3-fid. Achenes medium brown, ovoid to obovoid, compressed-trigonous, 3–4.5 × 1.7–2 mm; beak 0.7–2 mm.
Phenology: Fruiting late spring–summer.
Habitat: Emergent (to submerged), in fresh to slightly brackish ponds and marshes, spring-fed streams, mainly on coastal plains
Elevation: 10–100 m
Distribution
Ala., Del., Fla., Ga., La., Md., Miss., Mo., N.C., R.I., S.C., Tex., Va.
Discussion
Scirpus etuberculatus was placed in Scirpus sect. Bolboschoenus by T. Koyama (1958) and G. C. Tucker (1987).
Selected References
None.