Wiktionary
calamites
n. (plural of calamite English)
Wikipedia
Calamites
Calamites is a genus of extinct arborescent (tree-like) horsetails to which the modern horsetails (genus Equisetum) are closely related. Unlike their herbaceous modern cousins, these plants were medium-sized trees, growing to heights of more than 30 meters (100 feet). They were components of the understories of coal swamps of the Carboniferous Period (around ).
Usage examples of "calamites".
Sure enough, along the course followed by the inlet, the huge fern trees and calamites were flung down one after the other, their branches waving as they fell like vanquished standards.
Hidden by the calamites which now spilled across the balconythe effort of cutting them back had long seemed pointlessKerans watched him unobserved.