Carex umbellata Schkuhr ex Willdenow. Section: [26bbb] Section 39 Acrocystis. Parasol Sedge. Phen: Dec-Mar. Hab: Limestone barrens, other barrens and glades, old fields, mowed areas, other open habitats. Dist: Greenland west to AK, south through MN to TX and eastward.

Origin/Endemic status: Native

Taxonomy Comments: Molecular data (unpublished) indicate that C. microrhyncha is deeply embedded within C. umbellata. This group is receiving critical study by D.B. Poindexter.

Synonymy: = Ar, FNA23, G, Il, Mi, Mo1, NE, NY, Pa, Tn, Va, Sorrie et al (2011); = Carex abdita E.P.Bicknell – F; > Carex microrhyncha Mack. – ETx1, GrPl, K1, K3, K4, NcTx, Tx, Mackenzie (1931-1935); < Carex umbellata Schkuhr ex Willd. – C, RAB, W; > Carex umbellata Schkuhr ex Willd. – GrPl, K1, K3, K4, Mackenzie (1931-1935)

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