Monographs Details: Hippochaete laevigata var. polystachya Farw.
Authority: Farwell, Oliver A. 1916. The genus Hippochaete in North America, north of Mexico. Mem. New York Bot. Gard. 6: 461-472.
Family:Equisetaceae
Description:Species Description - A form in which the stem and its branches (not due to an injury) are simultaneously spike-bearing.

Discussion:

Equisetum Funstoni i. polystachyum A. A. Eaton, Fern Bull. 11: 12. 1903.

Equisetum laevigatum f. polystachyum A. A. Eaton, Fern Bull. 11:44. 1903.