- horsetail - perennial rushlike flowerless herbs with jointed hollow stems and narrow toothlike leaves that spread by creeping rhizomes; tend to become weedy; common in northern hemisphere; some in Africa and South America
--1 is a kind of fern ally
--1 is a member of Equisetum, genus Equisetum
--1 has parts: cone, strobilus, strobile
--1 has particulars: