(horse-tails; family Calamitaceae)
A species of jointed-stemmed plants that were an important component of Carboniferous swampland floras. Unlike their small modern counterparts some Carboniferous species grew to 18 m tall. Calamites cistiiformes was the earliest representative of the Calamitaceae and was first described in 1877. Calamatids are known throughout the northern hemisphere.
Subjects: Earth Sciences and Geography — Plant Sciences and Forestry.