fern ally - pteridophytes of other classes than Filicopsida

strobile, strobilus, cone - cone-shaped mass of ovule- or spore-bearing scales or bracts

Equisetum, genus Equisetum - horsetails; coextensive with the family Equisetaceae

common horsetail, Equisetum arvense, field horsetail - of Eurasia and Greenland and North America

Equisetum fluviatile, swamp horsetail, water horsetail - Eurasia; northern North America to Virginia

Equisetum hyemale, Equisetum hyemale robustum, Equisetum robustum, rough horsetail, scouring rush - evergreen erect horsetail with rough-edged stems; formerly used for scouring utensils

Equisetum palustre, marsh horsetail - scouring-rush horsetail widely distributed in wet or boggy areas of northern hemisphere

Equisetum Sylvaticum, wood horsetail - Eurasia except southern Russia; northern North America

Equisetum variegatum, variegated horsetail, variegated scouring rush - northern North America; Greenland; northern and central Europe