OPHIOGLOSSACEAE.
Ophioglossum vulgatum (L.) “Wabash county, a single plant.” Schneck. (P.) Probably elsewhere, but easily overlooked.
Botrychium obliquum (Muhl.) In open woods, Cook Co., rare. “S. Illinois. Vasey, Schneck.” (P.) Peoria Co., V. H. Chase. Starved Rock. J. H. Ferriss.
Botrychium obliquum dissectum. (Spreng.) Peoria Co., V. H. Chase.
Botrychium virginianum. (L.) Common in rich woods in the northeastern part of the state, and probably throughout. It often occurs in colonies, sometimes of a dozen or more plants. In woods along Lake Michigan it readies a height of two feet.