Equisetum

  

 
Equisetum arvense Linnaeus [W Bhutan, N India, Japan, Korea, Mongolia, Nepal, Russia; C and SW Asia, Europe, North America (including Greenland)].
Equisetum diffusum D. Don [Bhutan, NE India, Japan, Kashmir, Myanmar, Nepal, Pakistan, Vietnam].
Equisetum palustre Linnaeus [Japan, Kashmir, Korea, Mongolia, N Pakistan, Russia; C and SW Asia, Europe, North America].
Equisetum ramosissimum subsp. debile (Roxburgh ex Vaucher) Hauke  [Bangladesh, India, Indonesia, Japan, Laos, Malaysia, Myanmar, Nepal, New Guinea, Philippines, Singapore, Thailand, Vietnam; S Pacific islands (Fiji, New Caledonia, New Hebrides)].
Equisetum ramosissimum subsp. ramosissimum [Afghanistan, Bhutan, N India, Japan, Korea, Mongolia, Pakistan, Russia; Africa, C and SW Asia, Europe; introduced in North America (SE United States)].