Southcott's* Horsetail Family
Leafless plants with rush-like hollow and jointed stems terminated by the fructification in the from[sic] of a cone or spike.
Equisetum.---Moist shady places. Branches in whorls. Fertile stems simple, very different from the sterile ones. The base of each joint is surrounded by a sheath which is split into teeth, corresponding with the principal ridges of the stems.
*Mary Southcott. Some Newfoundland Wild Flowers.
St. John's, Newfoundland : Robinson and Company , 1915, p. 34-35