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This genus is accepted, and its native range is Tropical & Subtropical Old World, Americas to Tristan da Cunha.
Azolla microphylla


M. Thulin et al. Flora of Somalia Vol. 1-4 [updated 2008]

Morphology General Habit
Floating aquatic ferns with slender pinnately branched rhizomes and roots borne singly or in clusters
Morphology Leaves
Leaves alternate, imbricate, 2-lobed, with a green aerial lobe and a thin colourless hyaline lobe
Morphology Reproductive morphology Sori
Sori in thin-walled sporocarps borne on the basal leaf of a branch, megasporocarps with single megaspore with apical floating bodies, microsporocarps with numerous microsporangia and microspores embedded in massulae mostly with anchor-shaped outgrowths.
Family of a single genus.
The species live in symbiosis with a nitrogen-fixing blue-green alga, Anabaena azollae Strasb., colonies of which inhabit a cavity of the plant-body.
Six species in most warmer parts of the world, introduced in Europe.

Native to:

Alabama, Alaska, Angola, Argentina Northeast, Argentina Northwest, Argentina South, Arizona, Arkansas, Assam, Bangladesh, Benin, Bolivia, Borneo, Botswana, Brazil North, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, British Columbia, Bulgaria, Burundi, California, Cameroon, Chad, Chile Central, Chile North, Chile South, China North-Central, China South-Central, China Southeast, Colombia, Colorado, Connecticut, Costa Rica, Cuba, Delaware, District of Columbia, Dominican Republic, East Himalaya, Ecuador, El Salvador, Florida, French Guiana, Gabon, Galápagos, Gambia, Georgia, Ghana, Guatemala, Guyana, Haiti, Honduras, Illinois, India, Indiana, Iowa, Ivory Coast, Jamaica, Japan, Jawa, Kansas, Kentucky, Kenya, Korea, KwaZulu-Natal, Lesser Sunda Is., Louisiana, Madagascar, Maine, Malawi, Malaya, Mali, Maluku, Manchuria, Maryland, Massachusetts, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Michigan, Minnesota, Mississippi, Missouri, Mozambique, Myanmar, Namibia, Nansei-shoto, Nebraska, Nepal, Nevada, New Caledonia, New Guinea, New Hampshire, New Jersey, New Mexico, New South Wales, New York, New Zealand North, New Zealand South, Nicaragua, Niger, Nigeria, North Carolina, Northern Territory, Ohio, Oklahoma, Ontario, Oregon, Pakistan, Panamá, Paraguay, Pennsylvania, Peru, Philippines, Puerto Rico, Queensland, Rwanda, Senegal, Sierra Leone, Somalia, South Australia, South Carolina, South Dakota, Sri Lanka, Sudan, Sulawesi, Sumatera, Suriname, Taiwan, Tanzania, Tasmania, Tennessee, Texas, Thailand, Togo, Trinidad-Tobago, Tristan da Cunha, Uganda, Uruguay, Utah, Venezuela, Venezuelan Antilles, Victoria, Vietnam, Virginia, Washington, West Himalaya, West Virginia, Western Australia, Wisconsin, Zambia, Zaïre, Zimbabwe

Introduced into:

Belgium, Canary Is., Cape Provinces, Czechoslovakia, France, Free State, Germany, Great Britain, Greece, Hawaii, Hungary, Ireland, Italy, Lesotho, Morocco, Netherlands, Northern Provinces, Palestine, Portugal, Romania, Sardegna, Sicilia, Spain, Swaziland, Turkey-in-Europe

Azolla Lam. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Brummitt, R.K. [15499], United Kingdom 41123.000
Barker, C. [142], Indonesia 72496.000

First published in Encycl. 1: 343 (1783)

Accepted by

  • Balkrishna, A., Joshi, B., Sribastava, A., Shankar, R. & Shukla, B.K. (2019). Classification of extant Pteridophytes: a new approach Indian Fern Journal 36: 311-341.
  • Roskov Y. & al. (eds.) (2018). World Ferns: Checklist of Ferns and Lycophytes of the World Species 2000 & ITIS Catalogue of Life Naturalis, Leiden, the Netherlands.


Flora of Somalia

  • Fl. Trop. E. Afr. (1999).
  • Flora Somalia, Vol 1, (1993) Author: by M Thulin [updated by M. Thulin 2008]

Flora of Somalia
Flora of Somalia

Herbarium Catalogue Specimens

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at and
© Copyright 2017 World Checklist of Selected Plant Families.

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at and
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families.