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Equisetum arvense L. (As per efi thread: Subsp. arvense is confined to high, semi-dry inner Himalayan areas and becomes progressively rarer eastwards – finally dying out eastwards in Nepal. It is not known in West Bengal, or Sikkim, nor Bhutan or Arunachal Pradesh. Subsp. diffusum on the other hand – the common N. Indian taxon – is in the outer Himalaya to C. Himalayan ranges and goes right through N.E. India. In India, one is a typical European element dying out to the east and quite typically only reaching as far east as E. Nepal (at high altitude behind the Himalaya), the other is a Sino-Himalayan element, extending as far west as Pakistan. They are easy to distinguish as arvense has single ridges in the sheaths and diffusum has double ones, also arvense is sterile-fertile dimorphic with brown, achlorophyllous fertile stems that do not develop green branches, but die off – while diffusum is fertile on persistent and green branches and is not sterile-fertile dimorphic)
(Subarctic & Temp. Northern Hemisphere: Afghanistan, Alabama, Alaska, Albania, Alberta, Aleutian Is., Altay, Amur, Arizona, Arkansas, Austria, Azores, Baleares, Baltic States, Belarus, Belgium, British Columbia, Bulgaria, Buryatiya, California, Central European Rus, China North-Central, China South-Central, China Southeast, Chita, Colorado, Connecticut, Corse, Cyprus, Czechoslovakia, Delaware, Denmark, District of Columbia, East European Russia, Finland, France, Føroyar, Georgia, Germany, Great Britain, Greece, Greenland, Hungary, Iceland, Idaho, Illinois, India, Indiana, Inner Mongolia, Iowa, Iran, Iraq, Ireland, Irkutsk, Italy, Japan, Kamchatka, Kansas, Kazakhstan, Kentucky, Khabarovsk, Kirgizstan, Korea, Krasnoyarsk, Kriti, Krym, Kuril Is., Labrador, Magadan, Maine, Manchuria, Manitoba, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Mongolia, Montana, Nebraska, Nepal, Netherlands, Nevada, New Brunswick, New Hampshire, New Jersey, New Mexico, New York, Newfoundland, North Carolina, North Caucasus, North Dakota, North European Russi, Northwest European R, Northwest Territorie, Norway, Nova Scotia, Nunavut, Ohio, Oklahoma, Ontario, Oregon, Pakistan, Pennsylvania, Poland, Portugal, Primorye, Prince Edward I., Qinghai, Québec, Rhode I., Romania, Sakhalin, Sardegna, Saskatchewan, Sicilia, South Carolina, South Dakota, South European Russi, Spain, Svalbard, Sweden, Switzerland, Tadzhikistan, Tennessee, Texas, Tibet, Transcaucasus, Turkey, Turkey-in-Europe, Turkmenistan, Tuva, Ukraine, Utah, Uzbekistan, Vermont, Virginia, Washington, West Himalaya, West Siberia, West Virginia, Wisconsin, Wyoming, Xinjiang, Yakutskiya, Yugoslavia, Yukon as per POWO)          
Equisetum diffusum D. Don (Pakistan to China and Indo-China: Assam, Bangladesh, China North-Central, China South-Central, China Southeast, East Himalaya, India, Laos, Myanmar, Nepal, Pakistan, Thailand, Tibet, Vietnam, West Himalaya as POWO)
                             
     Equisetum ramosissimum var. huegelii (Milde ) Christenh. & Husby (Tropical & Subtropical Asia to SW. Pacific: Assam, Bangladesh, Borneo, Cambodia, China North-Central, China South-Central, China Southeast, Fiji, Hainan, India, Jawa, Laos, Lesser Sunda Is., Malaya, Maluku, Myanmar, Nepal, New Caledonia, New Guinea, Philippines, Solomon Is., Sri Lanka, Sulawesi, Sumatera, Taiwan, Thailand, Tibet, Vanuatu, Vietnam as per POWO)
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Some species found in India with description & keys from Flora of China (Distribution other than China): 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)] (syn. of Equisetum ramosissimum var. huegelii (Milde ) Christenh. & Husby as per POWO)
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)]. .
CRC World Dictionary of Medicinal and Poisonous Plants: Common Names … By Umberto Quattrocchi (2012)- Details-
Equisetum debile ROXB. (syn. of Equisetum ramosissimum var. huegelii (Milde ) Christenh. & Husby as per POWO)
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