Carex muehlenbergii var. enervis

Boott

Ill. Carex, 3: 124, plate 400. 1862.

Common names: Carex à utricule lisse
IllustratedEndemic
Synonyms: Carex onusta Mackenzie Carex plana Mackenzie
Treatment appears in FNA Volume 23. Treatment on page 294. Mentioned on page 293.

Pistillate scales 2–2.5 × 1.2–1.8 mm. perigynia veinless adaxially, 2.7–3.1 × 1.8–2.3 mm, beak 0.2–0.6(–1.0) mm.


Phenology: Fruiting late spring–early summer.
Habitat: Dry grasslands, open forests, commonly on sand
Elevation: 10–300 m

Distribution

V23 505-distribution-map.jpg

Ont., Ala., Ark., Conn., Ga., Ill., Ind., Iowa, Kans., Ky., La., Md., Mass., Mich., Minn., Miss., Mo., Nebr., N.H., N.J., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., Tenn., Tex., Vt., Va., W.Va.

Discussion

The distribution and ecology of Carex muehlenbergii var. enervis are unclear due to confusion with var. muehlenbergii. Plants of var. muehlenbergii that have a veinless perigynium have often been misidentified as var. enervis, but those plants are otherwise identical to var. muehlenbergii. Carex muehlenbergii var. muehlenbergii usually occurs on basic to slightly acidic soils; var. enervis often occurs on more acidic soils. It is not clear, however, whether that correlation is consistent.

Selected References

None.

Lower Taxa

None.
Peter W. Ball +
Carex à utricule lisse +
Ont. +, Ala. +, Ark. +, Conn. +, Ga. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, Nebr. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, R.I. +, S.C. +, Tenn. +, Tex. +, Vt. +, Va. +  and W.Va. +
10–300 m +
Dry grasslands, open forests, commonly on sand +
Fruiting late spring–early summer. +
Ill. Carex, +
Illustrated +  and Endemic +
Carex onusta +  and Carex plana +
Carex muehlenbergii var. enervis +
Carex muehlenbergii +
variety +