Vascular Plants of North Carolina
Account for Allegheny Sedge - Carex allegheniensis   Mackenzie
Members of Cyperaceae:
Members of Carex with account distribution info or public map:
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Section 5 » Family Cyperaceae
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AuthorMackenzie
DistributionPrimarily Mountains and upper Piedmont; scattered in the central and lower Piedmont; rare in the Coastal Plain (Cliffs of the Neuse State Park in Wayne County).

PA to northern GA, in or near the Appalachians.
AbundanceCommon in the Mountains, sporadic and generally rare elsewhere.
HabitatWetlands of many kinds, including swamps, seepages, bogs, wet streamsides, floodplain forests.
See also Habitat Account for General Sedge, Grass, and Rush Mires
PhenologyFlowering and fruiting May-June.
IdentificationAllegheny Sedge is very similar to Carex flexuosa, but separated by puberulent perigynia (vs. glabrous in flexuosa). Website editors relied on specimen annotations by M. Waterway.
Taxonomic CommentsIncludes Carex debilis var. pubera and much of C. debilis var. rudgei. This taxon was not named as a species in RAB (1968), but was included within C. debilis. The recent re-alignment of the Carex debilis group will take some time to be accepted by most/all botanists.

The genus Carex is the largest in North America, and among the largest in the world. In temperate and boreal regions, Carex is often the dominant or co-dominant ground layer in many habitats. Seeds (achenes) are valuable food for birds and small mammals, while foliage is used by birds and mammals to make nests and as food by mammals. Species of Carex often look vastly different from one another -- spikes erect vs. drooping, tiny inflorescence vs. whopping, culms leafy vs. naked, perigynia beaked vs. beakless, stems densely bunched vs. single, etc. The genus has been divided into many sections (or groups), based on shared characters; some taxonomists have suggested that these be different genera, but that proves unworkable (so far). All Carex share the feature of a perigynium (an outer covering) which completely surrounds the achene (seed). This covering may fit tightly or loosely (like a small bladder), depending on which group or species. Details of perigynia shape, ornamentation, presence and size of beak, number of striations (or veins) are all important ID features. In recent years Rob Naczi and colleagues have stressed the importance of arrangement of perigynia -- whether spiral (3+ ranks) or distichous (2-ranked) -- and have named a number of new species as well as split off some older synonyms. Therefore, RAB's (1968) key, excellent for its time, can only be used in a general way today. Members of some sections of Carex are difficult to key out (notably Ovales, Laxiflorae, Griseae); this is in part due to variation among individuals of a species, or failings of the key. FNA has drawings of most species and some species may be found in two or more places within a key, to acount for variability. New species to NC, and new to science(!), continue to be found in NC.
Other Common Name(s)None
State RankS3 [S4]
Global RankGNR
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