Monographs Details: Hippochaete laevigata var. funstoni (A.A.Eaton) Farw.
Authority: Farwell, Oliver A. 1916. The genus Hippochaete in North America, north of Mexico. Mem. New York Bot. Gard. 6: 461-472.

Equisetum Funstoni A. A. Eaton, Fern. Bull. 11: 10-12. 1903 (excluding forma polystachyum).

Equisetum laevigatum f. variegatoides A. A. Eaton, Fern Bull. 11: 43- 1903.

? Equisetum hiemale var. herbaceum A. A. Eaton, Fern. Bull. 11: 108-9. I903.

Similar to the specific type but very rough and the bases of the caducous teeth are more strongly incurved. Eaton described the spikes of E. Funstoni as "not apiculate as in the rest of the subgenus." H. laevigata has non-apiculate, i. e., rounded, spikes and E. Funstoni as distributed by Eaton has some of the spikes apiculate. The parenchyma is sometimes divided by the vallecular bast, sometimes not. Equisetum laevigatum f. variegatoides and Equisetum Funstoni f. caespitosum as distributed by Eaton are to be differentiated by only one character; the stems of the former are prostate, ascending, or erect, while those of the latter are ascending or erect—a distinction without a difference. Both have prominently white-bordered teeth fading to white throughout. There seems therefore to be no good reason for keeping Funstoni separate from laevigata. It has been collected in Wisconsin, Nebraska, Kansas, Wyoming, Utah, and California.