Equisetum palustre L. Swamps near Buffalo, Clinton, according to Eaton. Rare.
Equisetum hiemale L. Scouring Rush. Very common in swampy and gravelly places. Eaton describes seven forms.
Equisetum hiemale intermedium A. A. Eaton. Oneida Lake, Dr. J. V. Haberer. Rare.
Equisetum scirpoides Michx. Shaded ravines and sphagnum marshes. Widely scattered but scarce.
Equisetum sylvaticum L. Wood Horsetail. Marshes and borders of woods. Not uncommon. Eaton enumerates seven forms.
Equisetum variegatum Schleich. Brisbin Swamp, Coville; Oriskany and shores of Lake Ontario, Paine; Owasco Lake, Prof. I. H. Hall; along W. Canada Creek, near Herkimer, J. V. Haberer.
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.