Pteridophytes. UNDERWOOD. Our Native Ferns and their Allies.--Holt & Co., New York.

Spermaphytes. GRAY. Manual of the Botany of the Northern United States. 6th edition, 1890. This also includes the ferns, and the liverworts.--New York, Ivison & Co.

COULTER. Botany of the Rocky Mountains.--New York, Ivison & Co.

CHAPMAN. Flora of the Southern United States.--New York, 1883.

WATSON. Botany of California.

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