Carex billingsii (Knight) C.D.Kirschbaum
three-seeded bog sedge, Billings' sedge
three-seeded bog sedge, Billings' sedge
September 10,
Blue Hills Reservation, Canton
Perigynia thick, flat on one side (planoconvex) and not wing-margined (Group 3 character); nearly beakless or short-beaked in this species.