Scirpus pedicellatus Fernald
Family: Cyperaceae
Stalked Bulrush
Scirpus pedicellatus image
Paul Rothrock  
Plants aggregated in dense tussocks; rhizomes branching, short, tough, fibrous. Culms: fertile ones upright or nearly so; nodes without axillary bulblets. Leaves ca. 8 per culm; sheaths of proximal leaves green or brownish; proximal sheaths and blades with septa few to many, consipuous or inconspicuous; blades 42-77 cm × 5-9 mm. Inflorescences terminal; rays ascending, scabrous throughout or main branches smooth proximally, rays rarely with axillary bulblets; bases of involucral bracts green, brown, or blackish, not glutinous. Spikelets in open cymes, central spikelet of each cyme sessile, others usually pedicellate, spikelets ovoid, 3-9 × 2-3 mm; scales usually pale brown, black pigment absent (or sometimes a little beside distal midrib), oblong-elliptic, 1.4-1.8 mm, rounded or weakly mucronate, mucro (if present) to 0.1 mm. Flowers: perianth bristles persistent, 6, slender, contorted, much longer than achene, smooth, projecting beyond scales, mature inflorescence appearing woolly; styles 3-fid. Achenes whitish, elliptic or obovate in outline, plumply trigonous or plano-convex, 0.7-0.9 ´ 0.4-0.5 mm. 2n = 68. Fruiting summer (mid or late Jul). Usually in lowland marshes in stream valleys, edges of bogs, boggy meadows, and wet sandy shorelines; 0-500 m; N.B., N.S., Ont., Que.; Conn., Ill., Ind., Iowa, Maine, Mass., Mich., Minn., Mo., N.H., N.J., N.Y., Ohio, Pa., R.I., Vt., Wis. Scirpus pedicellatus often hybridizes with S. cyperinus and forms hybrid swarms.

Perennial herb with short, tough rhizomes, forming dense tussocks to 2 m tall Leaves: three-ranked, to eight per culm. Sheaths of lower leaves green or brownish. Blades 40 cm - 0.75 m long, 5 - 9 mm wide, keeled beneath. Inflorescence: a large, branched arrangement of spikelets, terminal, subtended by three leaf-like bracts. Bracts green, brownish, or blackish basally. Flowers: minute, subtended by a floral scale, lacking sepals and petals, bearing six persistent bristles. Bristles slender, contorted, much longer than achene, growing past the scales (giving the mature spikelets a woolly appearance). Stamens one to three, exserted. Pistil one. Style linear, three-cleft, base persistent. Fruit: a one-seeded achene, whitish, about 1 mm long and 0.5 mm wide, elliptic or reverse egg-shaped, plumply three-sided or flat on one side and convex on the other, minutely bumpy. Culm: to 2 m long, three-sided, solid. Spikelets: in open, ascending clusters, stalkless or stalked (central spikelet of each cluster always stalkless), 3 - 9 mm long, 2 - 3 mm wide, egg-shaped. Floral scales spirally arranged, pale brown, about 1.5 mm long, narrowly elliptic with a rounded apex that sometimes bears a tiny point.

Similar species: No information at this time.

Flowering: July to August

Habitat and ecology: Rare in the Chicago Region, where it grows in wet ground.

Occurence in the Chicago region: native

Etymology: Scirpus comes from the Latin name for a bulrush. Pedicellatus means "borne on pedicels (stalks)."

Author: The Morton Arboretum

From Flora of Indiana (1940) by Charles C. Deam
This so-called species is infrequent and is found throughout the state in habitats similar to those of Scirpus cyperinus.
Scirpus pedicellatus image
Paul Rothrock  
Scirpus pedicellatus image
Paul Rothrock  
Scirpus pedicellatus image
Paul Rothrock  
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