Cyperus diandrus Torrey. Umbrella Flatsedge. Phen: Jul-Oct. Hab: Interdune swales, ponds, exposed river and lake shores, usually where seasonally ponded. Dist: ME west to ND, south to VA, c. TN, n. AL, IL, MO, and IA.
Origin/Endemic status: Native
Syn: = C, F, FNA23, G, GrPl, GW1, Il, K1, K3, K4, Mi, Mo1, NY, Pa, S, Tn, Va, W