Flora of North America species comparison

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Carex muehlenbergii var. enervis

Carex muehlenbergii var. muehlenbergii
Photo is of parent taxon

carex à utricule lisse, Muhlenberg's sedge
Photo is of parent taxon

carex de mühlenberg, Muhlenberg's sedge
Perigynia

veinless adaxially, 2.7–3.1 × 1.8–2.3 mm, beak 0.2–0.6(–1.0) mm.

5–9-veined or veinless adaxially, 3–4.2 × 2–2.6(–3) mm, beak 0.8–1.2 mm.
Pistillate

scales 2–2.5 × 1.2–1.8 mm.

scales 2.5–3.6 × 1.6–2 mm.

Carex muehlenbergii var. enervis

Carex muehlenbergii var. muehlenbergii
Phenology Fruiting late spring–early summer. Fruiting late spring–early summer.
Habitat Dry grasslands, open forests, commonly on sand Dry grasslands, open forests, commonly on sand
Elevation 10–300 m (0–1000 ft) 10–300 m (0–1000 ft)
Distribution
from FNA
AL; AR; CT; GA; IA; IL; IN; KS; KY; LA; MA; MD; MI; MN; MO; MS; NC; NE; NH; NJ; NY; OH; OK; PA; RI; SC; TN; TX; VA; VT; WV; ON
[BONAP county map]
from FNA
AL; AR; CT; DC; DE; FL; GA; IA; IL; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; NC; NH; NJ; NY; OH; OK; PA; RI; SC; TX; VA; VT; WI; WV; ON; QC
[BONAP county map]
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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 23, p. 294. FNA vol. 23, p. 293.
Parent taxa Cyperaceae > Carex > sect. Phaestoglochin > Carex muehlenbergii Cyperaceae > Carex > sect. Phaestoglochin > Carex muehlenbergii
Sibling taxa
C. muehlenbergii var. muehlenbergii
C. muehlenbergii var. enervis
Synonyms C. onusta, C. plana
Name authority Boott: Ill. Carex, 3: 124, plate 400. (1862) unknown
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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