Halodule is a genus of plants in the family Cymodoceaceae described as a genus in 1841.Endlicher, Stephan Friedrich Ladislaus. 1841. Genera plantarum secundum ordines naturales disposita Supplementum 1(2)1368–1369 in Latin It is widespread on tropical and semi-tropical ocean shores of all continents except Europe and Antarctica.Davidse, G., M. Sousa Sánchez & A.O. Chater. 1994. Alismataceae a Cyperaceae. 6: i–xvi, 1–543. In G. Davidse, M. Sousa Sánchez & A.O. Chater (eds.) Flora Mesoamericana. Universidad Nacional Autónoma de México, México, D.F.Schatz, G. E., S. Andriambololonera, Andrianarivelo, M. W. Callmander, Faranirina, P. P. Lowry, P. B. Phillipson, Rabarimanarivo, J. I. Raharilala, Rajaonary, Rakotonirina, R. H. Ramananjanahary, B. Ramandimbisoa, A. Randrianasolo, N. Ravololomanana, Z.S. Rogers, C.M. Taylor & G. A. Wahlert. 2011. Catalogue of the Vascular Plants of Madagascar. Monographs in systematic botany from the Missouri Botanical Garden
Species Hybridization has been reported in the Pacific between H. pinifolia and H. uninervis.Ito, Y. and Nr. Tanaka (2011) Hybridisation in a tropical seagrass genus, Halodule (Cymodoceaceae), inferred from plastid and nuclear DNA phylogenies . Telopea 13: 219-231
There are six recognised species: Halodule bermudensis - Bermuda Halodule ciliata - Panama Halodule emarginata - SE Brazil Halodule pinifolia - India, Sri Lanka, Southeast Asia, Hainan, Taiwan, Ryukyu Islands, New Guinea, Queensland, Fiji, New Caledonia, Tonga, Caroline Islands Halodule uninervis - shores of Indian + Pacific Oceans, Red Sea, Persian Gulf, Bay of Bengal, Papuasia, Queensland, Micronesia Halodule wrightii - Atlantic Ocean shores including Caribbean + Gulf of Mexico: Africa (Senegal, Mauritania, Angola), West Indies, South America (Venezuela, Brazil), Mexico, Central America, United States (TX LA MS AL FL NC MD)
References
External links Jepson Manual Treatment