horsetail-tree

from The Century Dictionary.

• noun A name of trees or shrubs (principally Australian) of the genus Casuarina, of the natural order Casuarineæ, and particularly of C. equisetifolia, a tree sometimes 150 feet in height, now extensively naturalized in many tropical and subtropical countries of both the old and the new world: so called from the leafless, wiry branches, which much resemble the stems of Equisetum.