Research Paper

Claoxylon (sect. Affinia) dipulvinum (Euphorbiaceae), a new species from the Moluccas, Indonesia

Adhy Widya Setiawan, Syuhada Asdini, Tatik Chikmawati, Peter C. Van Welzen

Published on: 30 June 2020

Page: 348 - 352

DOI: 10.6165/tai.2020.65.348

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    Abstract

    A new species of Claoxylon from Halmahera, Talaud and Obi Islands is described and photographed. The species shows similarity with C. brachyandrum and C. longifolium, but it differs from C. brachyandrum in having petioles with a double pulvinus, one basally and one apically (pulvini ca. 2 cm long), and it differs from C. longifolium in the number of stamens, being less than 30. The new species can be divided into two varieties, also new to science, differing in the colour of the indumentum, number of staminate flowers per node and number of stamens. An identification key to the varities, a distribution map, and illustrations are provided.

    Keyword: Claoxylon, Euphorbiaceae, Halmahera, new species, Obi, swollen pulvinus, varieties

    Literature Cited

    Airy Shaw, H.K. 1982. The Euphorbiaceae of Central Malesia (Celebes, Moluccas, Lesser Sunda Is.). Kew Bull. 37(1): 1?40.
    DOI: 10.2307/4114718View Article Google Scholar

    Backer, C.A. and Jr. R.C. Bakhuizen van den Brink. 1964. Flora of Java 1. N.V. P. Noordhoff, Groningen.

    Forster, P.I. 2007. A taxonomic revision of Claoxylon A.Juss. (Euphorbiaceae) in Australia. Austrobaileya 7: 451?472.

    Holthuis, L.B. and H.J. Lam. 1942. A first contribution to our knowledge of the flora of the Talaud Islands and Morotai. Blumea 5: 93?256.

    Kabouw, P., P.C. van Welzen, P. Baas, B.J. van Heuven. 2008. Styloid crystals in Claoxylon (Euphorbiaceae) and allies (Caloxylinae) with notes on the leaf anatomy. Bot. J. Linn. Soc. 156(3): 445?457.
    DOI: 10.1111/j.1095-8339.2007.00757.xView Article Google Scholar

    Pax, F and K. Hoffmann. 1914. Euphorbiaceae-Acalypheae-Mercurialinae. In: Engle, A (ed.), Das Pflanzenreich IV.147.vii: 100?131 Leipzig and Berlin: Verlag von Wilhelm Engelmann.

    Radcliffe-Smith, A. 2001. Genera Euphorbiacearum. Kew: Royal Botanic Gardens, UK.

    Smith, A.C. 1981. Claoxylon. In: Smith AC (ed),.Flora Vitiensis Nova 2: 516?522. Kauai: Pacific Tropical Botanical Garden.

    van Welzen, P.C., S. Arias Guerrero, D. Arifiani, T. Bangun, R. Bouman, M. Eurlings, I. Gushilman, P. Philipson, I. Tabak, E. Winkel and K. Wurdack. 2020. Weda, a new genus with two new species of Euphorbiaceae-Crotonoideae from Halmahera (North Maluku, Indonesia) and phylogenetic relationships of the Australian tribe Ricinocarpeae. J. Syst. Evol., in Early View: https://doi.org/10.1111/jse.12581.
    DOI: 10.1111/jse.12581View Article Google Scholar