Subgenus
Equisetum
Equisetum telmateia. Photo: (c) Aleksandr Popov / Александр Попов, some rights reserved (CC BY-NC)
Equisetum (/ˌɛkwɪˈsiːtəm/; horsetail, snake grass, puzzlegrass) is the only living genus in Equisetaceae, a family of vascular plants that reproduce by spores rather than seeds.