Illustration by Sydenham Edwards in Curtis's Botanical Magazine, 1815
Thalia is a genus of six currently recognized species found in aquatic or marshy habitats, ranging in Africa from Senegal to Sudan to Zimbabwe, and in the Americas from Illinois to Argentina. Alligator-flag is a common name for plants in this genus. The generic name is in honor of Johannes Thal (1542–1583), a German doctor who wrote a Flora of the Harz Mountains.
Semihardy in cultivation, it needs protection against frosts. It can be propagated by seed or division of the rootstock in the spring.
- Thalia dealbata Fraser - southeastern United States
- Thalia densibracteata Petersen - Brazil
- Thalia geniculata L. - Africa, Florida, Louisiana, tropical Americas
- Thalia multiflora Horkel ex Körn. - Argentina, Brazil, Uruguay
- Thalia pavonii Körn. - Ecuador
- Thalia petersiana K.Schum. in H.G.A.Engler (ed.) - Brazil
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