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See list of 195 species in this genus

Collections of Carex should include basal portions of the stems and underground organs. 
The basal portion of the plant is important for observing the morphology of the basal leaves (e.g., sheath color, presence/absence of blades, form of sheath upon disintegration). Underground organs are necessary to determine if a species is rhizomatous or cespitose (at the minimum, notes about a plant’s habit should be made on herbarium collections). Collections of Carex that lack mature spikes may not be able to be confidently determined. Some hybridization does occur, particularly within certain sections (e.g., Glareosae, Hymenochlaenae, Phacocystis, Vesicariae). Carex divulsa Stokes was reported from MA by Kartesz (1999), based on Hermann (1954), who reported C. virens Lam. The specimen was stated to be housed at US; however, searches of that museum have not been able to locate a voucher for this report. Carex laevigata Sm. (section Elatae) was thought to have been collected by Greene from Massachusetts near Boston in the early 1800s (Fernald 1911). It is unsure if the plant represents a mix-up in labeling (i.e., the origin was incorrectly thought to be United States) or if this species was truly collected in New England. In either case, no other collections have been reported, and the plant is not included in the following identification keys. Carex comosa ×C. lurida was reported from MA by Sorrie and Somers (1999). The voucher specimen is C. luridaFernald and Long 18155 ( MASS!). Reports of the hybrid Carex crinita ×C. scabrata from ma and nh were based on collections of C. gynandra (specimens at GH! and NEBC!). Reports of Carex ×‌sullivantii Boott were based on a specimen cultivated at the Cambridge Botanic Garden (specimen at NEBC!). Reports of Carex ×‌aestivaliformis Mackenzie from MA were based on a collection of C. aestivalis—3 Aug 1916, Churchill s.n. ( NEBC!).

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 Show photos of:   Each photo represents one species in this genus.