Ottelia is a genus of an aquatic plant family Hydrocharitaceae described as a genus in 1805. The genus is native to tropical and subtropical regions of Africa, Asia, South America, and Australia. Species 1. \n* Ottelia acuminata (Gagnep.) Dandy - S China 2. \n* Ottelia alismoides (L.) Pers. - Khabarovsk, Primorye, China, Indian Subcontinent, SE Asia, New Guinea, Solomon Is, N Australia 3. \n* Ottelia balansae (Gagnep.) Dandy - S China, Vietnam 4. \n* Ottelia brachyphylla (Gürke) Dandy - Sudan 5. \n* Ottelia brasiliensis (Planch.) Walp. - Brazil, Paraguay, NE Argentina 6. \n* Ottelia cordata (Wall.) Dandy - Hainan, Thailand, Myanmar, Cambodia 7. \n* Ottelia cylindrica (T.C.E.Fr.) Dandy - Zaïre, Zambia, Angola 8. \n* Ottelia emersa Z.C.Zhao & R.L.Luo - Guangxi 9. \n* Ottelia exserta