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Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Rosids
Cladus: Eurosids I
Ordo: Malpighiales

Familia: Euphorbiaceae
Subfamilia: Euphorbioideae
Tribus: Hippomaneae
Subtribus: Carumbiinae
Genus: Homalanthus
Species (23 accepted): H. acuminatus – H. arfakiensis – H. caloneurus – H. ebracteatua – H. fastuosus – H. giganteus – H. grandifolius – H. longipes – H. longistylus – H. macradenius – H. nervosus – H. novoguineensis – H. nutans – H. polyadenius – H. polyandrus – H. populifolius – H. populneus – H. remotus – H. repandus – H. schlechteri – H. stillingifolius – H. stokesii – H. trivalvis
Source(s) of checklist:

Homalanthus A.Juss., Euphorb. Gen. 50. (1824)

Type species: Homalanthus leschenaultianus A. Juss. (1824) vide Homalanthus populneus (Geiseler) Pax in H.G.A.Engler & K.A.E.Prantl, Nat. Pflanzenfam. 3(5): 96. (1892)


Duania Noronha, Verh. Batav. Genootsch. Kunsten 5(4): 2. (1790), nom. nud.
Carumbium Reinw., Elench. Sem.: 319. (1823)
Omalanthus A.Juss., Euphorb. Gen.: 50. (1824), sphalm.
Garumbium Blume, Flora 8: t. 103. (1825)
Wartmannia Müll.Arg., Linnaea 34: 218. (1865)
Dibrachion Regel, Index Seminum (LE, Petropolitanus) 1865: 51 (1866)

Primary references

Jussieu, A.H.L. de 1824. De Euphorbiacearum Generibus medisque earumdem viribus tentamen. 118 pp. Paris. BHL Reference page. : 50. t. 16.

Additional references

A discussion concerning the use of Homalanthus versus Omalanthus


Govaerts, R. et al. 2020. Homalanthus in World Checklist of Selected Plant Families. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2020 Jul 14. Reference page.
International Plant Names Index. 2020. Homalanthus. Published online. Accessed: Jul 14 2020. 2020. Homalanthus. Missouri Botanical Garden. Published on the internet. Accessed: 2020 Jul 14.

Vernacular names
العربية: ملساء الزهر
中文: 澳杨属

Homalanthus is a plant genus of the family Euphorbiaceae first described as a genus in 1824.[3] It is the only genus in subtribe Carumbiinae. The genus is native to tropical Asia, Australia, and various islands in the Pacific.[2][4]

When published, the generic name was spelt as "Omalanthus".[3] Since the name comes from the ancient Greek word homalos meaning "smooth" and anthos meaning "flower", this original spelling was inconsistent with the general Greek transliteration rules, and many later authors changed it to Homalanthus. According to ICBN, Homalanthus, which can be found in its Appendix III, has now been conserved against the original Omalanthus.[5]


Homalanthus acuminatus - Tahiti
Homalanthus arfakiensis - Maluku, West New Guinea
Homalanthus caloneurus - Brunei, Sabah
Homalanthus ebracteatua - Vanuatu
Homalanthus fastuosus - Lan Yü, Philippines
Homalanthus giganteus - Java, Lesser Sunda Islands
Homalanthus grandifolius - Sumatra, Borneo
Homalanthus longipes - Vanuatu
Homalanthus longistylus - Papua New Guinea, Bismarcks
Homalanthus macradenius - Philippines
Homalanthus nervosus - New Guinea
Homalanthus novoguineensis- Papua New Guinea, Bismarcks, Solomons, Maluku, Lesser Sunda, NT, Qld, WA
Homalanthus nutans- many Pacific Islands
Homalanthus polyadenius - Papua New Guinea
Homalanthus polyandrus - Kermadec
Homalanthus populifolius - Papua New Guinea, Bismarcks, Solomons, Norfolk I, Lord Howe I, NSW, Qld, Vic
Homalanthus populneus - S Thailand, Malaysia,, Indonesia, Philippines; naturalized in Hawaii
Homalanthus remotus - West New Guinea
Homalanthus repandus - New Caledonia, Loyalty Is
Homalanthus schlechteri - New Caledonia, Loyalty Is
Homalanthus stillingiifolius - NSW, Qld
Homalanthus stokesii - Rapa-Iti
Homalanthus trivalvis - Solomons


Tropicos, search for name Homalanthus
Kew World Checklist of Selected Plant Families
Jussieu, Adrien Henri Laurent de. 1824. De Euphorbiacearum Generibus Medicisque earumdem viribus tentamen, tabulis aeneis 18 illustratum 50
Govaerts, R., Frodin, D.G. & Radcliffe-Smith, A. (2000). World Checklist and Bibliography of Euphorbiaceae (and Pandaceae) 1-4: 1-1622. The Board of Trustees of the Royal Botanic Gardens, Kew.
International Code of Botanical Nomenclature (Vienna Code). International Association for Plant Taxonomy. 2006. ISBN 3-906166-48-1.

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