Scirpus ancistrochaetus


Rhodora 64: 44, plate 1266, fig. 1. 1962.

Common names: Scirpe à crochets
Treatment appears in FNA Volume 23. Treatment on page 16. Mentioned on page 10, 14, 15.

Plants cespitose; rhizomes brownish, short, tough, fibrous. Culms: fertile ones upright or reclining; nodes sometimes with axillary bulblets. Leaves 5–9 per culm; sheaths of proximal leaves green to whitish or brown; proximal sheaths and blades with septa many, conspicuous; blades 32–68 cm × 7–13(–16) mm. Inflorescences terminal, rarely also with 1 lateral inflorescence from distal leaf axil; rays all arching or sometimes 1 or 2 ascending, distal branches scabrous, proximal branches smooth, rarely scabrellous, rays sometimes with axillary bulblets; bases of involucral bracts green, margins usually speckled with red-brown, not glutinous. Spikelets in clusters of 2–18 (largest cluster with 8 or more), spikelets sessile, ovoid to narrowly ovoid, 3–5 × 2–3 mm; scales brown or blackish brown with greenish midribs, elliptic, 1.5–2.5 mm, apex slightly mucronate, mucro 0.05–0.1(–0.2) mm. Flowers: perianth bristles persistent, 6, stout, straight or curved, slightly shorter to slightly longer than achene, with retrorse, thick-walled, sharp-pointed teeth densely arranged in distal 0.6–0.9, enclosed within scales; styles 3-fid. Achenes pale brown, elliptic to obovate in outline, plano-convex, 1.1–1.7 × 0.6–0.8 mm. 2n = 54.

Phenology: Fruiting late spring–early summer (Jul).
Habitat: Growing in wet depressions, bogs, sinkhole ponds, or adjacent to pools
Elevation: 100–1100 m


V23 11-distribution-map.jpg

Que., Md., Mass., N.H., N.Y., Pa., Vt., Va., W.Va.


Scirpus ancistrochaetus occasionally hybridizes with S. hattorianus. Scirpus ancistrochaetus once grew in Washington County, New York; it is apparently no longer present in the state.

Scirpus ancistrochaetus is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Selected References


Lower Taxa

... more about "Scirpus ancistrochaetus"
Alan T. Whittemore +  and Alfred E. Schuyler +
Schuyler +
Scirpe à crochets +
Que. +, Md. +, Mass. +, N.H. +, N.Y. +, Pa. +, Vt. +, Va. +  and W.Va. +
100–1100 m +
Growing in wet depressions, bogs, sinkhole ponds, or adjacent to pools +
Fruiting late spring–early summer (Jul). +
Scirpus ancistrochaetus +
species +