Cyperus echinatus

(Linnaeus) Alph. Wood

Class-book Bot. ed. s.n.(b), 734. 1861.

Common names: Teasel sedge
Basionym: Scirpus echinatus Linnaeus Sp. Pl. 1: 50. 1753
Synonyms: Cyperus ovularis (Michaux) Torrey Cyperus ovularis var. americanus Boeckeler Cyperus ovularis var. sphaericus Boeckeler Cyperus ovularis var. wolfii (Alph. Wood) Kükenthal Cyperus wolfii Kyllinga ovularis Mariscus ovularis
Treatment appears in FNA Volume 23. Treatment on page 182. Mentioned on page 149, 183.

Herbs, perennial, single-stemmed to loosely cespitose. Culms basally cormlike, trigonous, (15–)30–100 cm × 0.5–3.5 mm, glabrous. Leaves flat to V-shaped, 10–65 cm × 3–9 mm, adaxial surface, margins minutely scabridulous. Inflorescences: spikes densely globose to globose-ovoid, 8–17 mm wide; rays 3–12, 2–12 cm, scaberous adaxially especially distally; rachis 4–8 mm; bracts (3–)4–7, ascending at 30(–45)°, flat, 5–35 cm × 2–9 mm; rachilla persistent, wings 0.5–0.7 mm wide. Spikelets 50–100, oblong-lanceoloid, ± terete-quadrangular, (3.5–)4–7 × 1–1.4 mm; distal spikelet spreading or ascending; floral scales persistent, 3–5, appressed, stramineous to brownish, 4-ribbed laterally, oblong-elliptic, 3.5–4.5 × 1–1.8 mm, membranous, apex entire or emarginate with mucro to 0.3 mm. Flowers: anthers 0.4–0.8 mm; styles 0.5–0.6 mm; stigmas 1 mm. Achenes brown, ± stipitate, oblong, (1.5–)1.8–2.3 × 0.5–0.6(–0.7) mm (1/2 length of floral scales), apex obtuse, surfaces puncticulate.

Phenology: Fruiting summer–early fall.
Habitat: Disturbed, sunny sites, in mesic places, well-drained soils
Elevation: 0–500 m


V23 312-distribution-map.jpg

Ala., Ark., Del., D.C., Fla., Ga., Ill., Ind., Kans., Ky., La., Md., Miss., Mo., N.J., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., Tenn., Tex., Va., W.Va., Wis., West Indies.


The records for Rhode Island and Wisconsin are according to M. L. Horvat (1941); we have not seen specimens from those states.

Cyperus echinatus is usually recognized by its tight, nearly spheric spikes; it may occasionally be hard to distinguish from C. croceus and C. retrorsus. Compared to C. retrorsus, C. echinatus has larger spikelets and longer floral scales, anthers, and achenes. In contrast to C. echinatus, C. croceus has looser spikes, shorter, broader, greenish or yellowish floral scales, shorter, more ovoid achenes, and shorter anthers. Furthermore, C. echinatus is predominantly an inland species of roadsides, pastures, and other disturbed ground; C. retrorsus is primarily a coastal species and occurs in drier, sandier sites.

Selected References


Lower Taxa

... more about "Cyperus echinatus"
Gordon C. Tucker* +, Brian G. Marcks* +  and J. Richard Carter * +
(Linnaeus) Alph. Wood +
Scirpus echinatus +
Teasel sedge +
Ala. +, Ark. +, Del. +, D.C. +, Fla. +, Ga. +, Ill. +, Ind. +, Kans. +, Ky. +, La. +, Md. +, Miss. +, Mo. +, N.J. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, R.I. +, S.C. +, Tenn. +, Tex. +, Va. +, W.Va. +, Wis. +  and West Indies. +
0–500 m +
Disturbed, sunny sites, in mesic places, well-drained soils +
Fruiting summer–early fall. +
Class-book Bot. ed. s.n.(b), +
Illustrated +
Cyperus ovularis +, Cyperus ovularis var. americanus +, Cyperus ovularis var. sphaericus +, Cyperus ovularis var. wolfii +, Cyperus wolfii +, Kyllinga ovularis +  and Mariscus ovularis +
Cyperus echinatus +
Cyperus subg. Cyperus +
species +