Caltha alba Cambess. (NW. Iran, Afghanistan to W. Himalaya: Afghanistan, Iran, Pakistan, West Himalaya as per POWO)
Caltha palustris L. (Temp. & Subarctic Northern Hemisphere: Afghanistan, Alaska, Albania, Alberta, Aleutian Is., Altay, Amur, Assam, Austria, Baleares, Baltic States, Belarus, Belgium, British Columbia, Bulgaria, Buryatiya, Central European Rus, China North-Central, China South-Central, China Southeast, Chita, Connecticut, Czechoslovakia, Delaware, Denmark, East European Russia, East Himalaya, Finland, France, Føroyar, Germany, Great Britain, Greece, Hungary, Iceland, Illinois, Indiana, Inner Mongolia, Iowa, Iran, Iraq, Ireland, Irkutsk, Italy, Japan, Kamchatka, Kazakhstan, Kentucky, Khabarovsk, Korea, Krasnoyarsk, Krym, Kuril Is., Labrador, Magadan, Maine, Manchuria, Manitoba, Maryland, Massachusetts, Michigan, Minnesota, Missouri, Mongolia, Myanmar, Nebraska, Netherlands, New Brunswick, New Hampshire, New Jersey, New York, Newfoundland, North Carolina, North Caucasus, North Dakota, North European Russi, Northwest European R, Northwest Territorie, Norway, Nova Scotia, Nunavut, Ohio, Ontario, Oregon, Pakistan, Pennsylvania, Poland, Portugal, Primorye, Prince Edward I., Québec, Rhode I., Romania, Sakhalin, Saskatchewan, South Carolina, South Dakota, South European Russi, Spain, Sweden, Switzerland, Tennessee, Tibet, Transcaucasus, Turkey, Tuva, Ukraine, Vermont, Virginia, Washington, West Himalaya, West Siberia, West Virginia, Wisconsin, Xinjiang, Yakutskiya, Yugoslavia, Yukon as per POWO)
Caltha scaposa Hook. fil. & Thomson (Central & E. Himalaya to W. & Central China: China North-Central, China South-Central, East Himalaya, Nepal, Qinghai, Tibet as per POWO)
Species with description & keys from Flora of Pakistan (Distribution):
Caltha alba Camb. (Pakistan & Kashmir. Usually growing gregariously by streams at 2700-4300 m)
Caltha palustris L. (The yellow flowered ‘Marsh Marigold’ has not been collected from our area. However it has been reported from E. Kashmir)
Species with distribution in annotated checklist of Flowering plants of Nepal (Distribution):
Caltha govaniana Wall. ex Royle (4100 m; Himalaya (Kashmir to Bhutan)) (syn. of Caltha palustris var. himalaica Tamura as per POWO)
Caltha palustris var. himalaica Tamura
Caltha palustris var. himalensis (D. Don) Mukerjee (2400-4200 m; Himalaya) (syn. of Caltha alba Cambess. as per CoL)
Caltha scaposa Hook. f. & Thomson (2700-5500 m; Himalaya (Nepal to NEFA). Tibet, W. China)
Some species found in Indian Subcontinent with description & keys from Flora of China [Distribution other than China]:
Caltha palustris Linnaeus [most temperate regions of N hemisphere].
Caltha palustris var. himalaica Tamura [Bhutan, Nepal].
Caltha palustris var. palustris [temperate to cold regions of northern hemisphere].
Caltha scaposa J. D. Hooker & Thomson [Bhutan, N India, Nepal, Sikkim].
Caltha (Ranunculaceae) page with comparative images:
Pl. go through Caltha (Ranunculaceae) page with comparative images of species in efloraofindia. On clicking the link of species, one can check the complete details. Genus pages generally give details of most of the species found in India.
I request you to pl. go through & point out mistakes, if any. I hope this will aid in identification in future. If anybody can send images of other species of this genus (for incorporation in the website), if any, or can identify unidentified images, it will be really nice.