Isoetaceae.
Isoetes Amesii A. A. Eaton, sp. n. (I. riparia Canadensis Engelm. Also I. Dodgei Eaton.) Peekskill is the only known locality in this State, but the species is very common in New England.
Isoetes echinospora Braunii Engelm. The common form in New York State.
Isoetes echinospora muricata Engelm. Lake Luzern, A. A. Eaton. Rare.
Isoetes Engelmanni A. Br. Abundant along the Susquehanna river in Broome and Tioga counties, Clute. New York City, Buchheister.
Isoetes macrospora Durien. Catskill Mts., Schweinitz, according to A. A. Eaton. (I. lacustris paupercula Engelm.) Rare.