Equisetaceae Michx. ex DC.
Stems siliceous, longitudinally grooved, jointed. Lvs each with 1 unbranched vein, united into whorls, sheathing the stems at nodes. Sporangia borne on stalked, peltate sporangiophores arranged in whorls to form distinct strobili. Homosporous; spores with chlorophyll and 4 elaters. Gametophytes green and surface-living.
1 living genus, cosmopolitan except for Australia and N.Z.
