calamites

calamites |ˌkaləˈmʌɪtiːz | ▶noun ( pl. same ) a swamp plant with jointed stems that belonged to an extinct group related to the horsetails, growing to a height of 18 m (60 ft ). ●Calamites and other genera, family Calamitaceae, class Sphenopsida. ORIGIN modern Latin, from calamus .