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The Genus Syzygium (Myrtaceae) in Vanuatu

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The Genus Syzygium (Myrtaceae) in Vanuatu Blumea 58, 2013: 53–67 www.ingentaconnect.com/content/nhn/blumea RESEARCH ARTICLE http://dx.doi.org/10.3767/000651913X672271 The genus Syzygium (Myrtaceae) in Vanuatu S.H. Tuiwawa1,2,4, L.A. Craven1, C. Sam3, M.D. Crisp2 Key words Abstract Twenty species of Syzygium occur in Vanuatu of which eighteen are indigenous (six being endemic and one being an ancient introduction) and two are recently introduced. Three species are newly described: S. chanelii, biogeography S. flabellum and S. vanuatuense. The Syzygium flora of Vanuatu has strong links at species level to that of the ecology Solomon Islands and Fiji, less strong links to elsewhere in the southwest Pacific and apparently no links to New Myrtaceae Caledonia. Descriptions are provided for each species occurring in Vanuatu and identification keys are provided systematics for flowering and vegetative material. Syzygium taxonomy Published on 23 August 2013 Vanuatu INTRODUCTION Based on the classification of Syzygium by Craven & Biffin (2010), nineteen of the Vanuatuan species of Syzygium belong With c. 1 200 species, Syzygium is the largest genus in Myrta­ in subg. Syzygium and the remaining species, S. chanelii, ceae. It has a subtropical to tropical distribution, from Africa ex- belongs in sect. Piliocalyx. Indigenous species in common tending east to the Hawaiian Islands and from India and China between Vanuatu, the Solomon Islands and New Guinea may southwards to southern Australia and New Zealand. The centres be indicative of a west to east route of dispersal, however, the of diversity are the southern Asian, Southeast Asian, Malesian, possibility that a species evolved in Vanuatu and then dispersed Australian and New Caledonian regions, with decreasing spe- to the west cannot be discounted. The extra-Vanuatuan distribu- cies richness elsewhere (Craven 2001, Parnell et al. 2006). tion of the indigenous, non-endemic species is given in Table 1. A monograph of the woody flora of Vanuatu is yet to be pub- Of these twelve species, seven also occur in the Solomon lished and there is little published information available on this Islands with five of these extending to New Guinea, four also component of its flora. Some species are recorded in Guil- occur in Fiji, and one, S. clusiifolium, also occurs in Polynesia. laumin’s (1931) enumeration and Wheatley’s (1992) guide; The remaining species, S. malaccense, occurs widely in the neither of which are adequate as a flora per se of Vanuatu. In Malesian-southwest Pacific region but its natural range is prob- view of there being an account of Syzygium available for Fiji ably New Guinea and Australia (Craven unpubl.). This species (Smith 1985; in which Cleistocalyx and Piliocalyx were treated is widely cultivated and probably represents an example of as genera distinct from Syzygium) and New Caledonia (Dawson early human introduction to the southwest Pacific islands and 1999; this did not include Piliocalyx of which c. 20 species occur to central-western Malesia. The two non-indigenous species, in New Caledonia), and current work in progress by the second S. cumini and S. jambos are relatively recent introductions to author on Syzygium in the Solomon Islands, a study of the ge- Vanuatu and have there naturalised. Interestingly, there appear nus in Vanuatu was considered warranted. Not only would this to be no species shared with New Caledonia and given the fill a gap in knowledge of Syzygium in the southwestern Pacific proximity of the latter to Vanuatu this is surprising. The only but, as the Vanuatu archipelago occupies a central position link with New Caledonia seems to be sect. Piliocalyx, a taxon with respect to the Solomon Islands, Fiji and New Caledonia, restricted to New Caledonia (c. 20 endemic species), Vanuatu such a study might therefore be of interest biogeographically. (one endemic species) and Fiji (one endemic species). Within Vanuatu, some aspects of the distribution of the indigenous Vanuatu is an archipelago of more than 80 islands spread species may be noted. The distribution of each species by is- across c. 830 km between c. 13°S and 21°S latitude and its land is given in tabular form in Table 2 and from the map of the major islands are shown in Map 1. Its climate is tropical with archipelago (Map 1) the spatial relationships of these islands two seasons, the trade wind season occurring between May can be determined. As the floristic exploration of Vanuatu is far and October, and the hurricane season between November and from complete it is not possible to be definitive but nonetheless April. The average yearly rainfall ranges from 4 000 mm in the some comments can be made. Vanuatu endemics may be re- northern Banks and Torres Islands to 2 200 mm in the southern stricted to a single island (S. aneityense) or widely distributed islands. The average annual temperature ranges from 26.1 °C (S. kajewskii); this may reflect differences in dispersibility, soil in the northern islands to 24.6 °C in the central and to 23.5 °C tolerance and/or relative evolutionary age. Of the non-endemic in the southertn islands (Giovanelli 1966). species, S. clusiifolium and S. tierneyanum are widespread but 1 Australian National Herbarium, CSIRO Plant Industry, GPO Box 1600, S. gracilipes and S. seemannii each are known from a single Canberra, ACT 2601, Australia; island and it may be that the last two have relatively recently corresponding author e-mail: [email protected]. been dispersed to Vanuatu. Several islands have a relatively 2 Research School of Biology, The Australian National University, Canberra, high number of species, e.g., Aneityum, Espiritu Santo, Efate, ACT 0200, Australia. 3 Forestry Department, Port Vila, Efate, Vanuatu. but this does not seem to be a function of size alone as Aneityum 4 Present address: Institute of Applied Science, The University of the South is small relative to the other two named islands and there may Pacific, Suva, Fiji Islands. be other factors responsible. © 2013 Naturalis Biodiversity Center You are free to share - to copy, distribute and transmit the work, under the following conditions: Attribution: You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work). Non-commercial: You may not use this work for commercial purposes. No derivative works: You may not alter, transform, or build upon this work. For any reuse or distribution, you must make clear to others the license terms of this work, which can be found at http://creativecommons.org/licenses/by-nc-nd/3.0/legalcode. Any of the above conditions can be waived if you get permission from the copyright holder. Nothing in this license impairs or restricts the author’s moral rights. 54 Blumea – Volume 58 / 1, 2013 166° Filament — is the male reproductive part of a plant topped by 13° the anther together forming the stamen. It is free for most N Torres of the Syzygium species whilst it is physically fused at the Islands base for others (Briggs & Johnson 1977). Hypanthium — floral structure that is the fusion of the sepals, Vanua Lava Banks Islands 100 km petals and stamen forming a cuplike or tubular extension of a flower. The stipe in the hypanthium is part of the pedicel/ Gaua hypopodium (Briggs & Johnson 1977). 169° Hypopodium — the lowerbase or the lowermost division of the 15° internode between the flower(s) and the penultimate node Maewo Espiritu Santo Aoba of the inflorescence axis bearing the flower(s) (Briggs & Johnson 1977). Malo Pentecost Inflorescences — cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement Ambrym Malakula of branches spanned (Briggs & Johnson 1977). The width Paama of inflorescence is the total length in which the lateral axes Lopevi 167° Epi spans. Tongoa Shepherd 17° Intrusive tissue — seed structure containing branching vascular Emae Islands tissue that is continuous with the axile vascular strand in the Nguna flower and provides an extensive surface area for the pos- sible diffusion of food into the developing embryo (Hartley Efate & Craven 1977). Equator Open and closed venation — degree of development of tertiary Manus I. New Ireland veins (Hartley & Perry 1973). In leaves with open venation New Britain New 170° E the tertiary veins are not as well developed as the secondary Guinea Erromango Solomon Is. 19° S and do not reach the intramarginal veins as do the secondary Santa Cruz Is. veins. In leaves with closed venation the tertiary veins are Aniwa as well developed as the secondary veins. In leaves with Tanna Futuna VANUATU closed venation, the tertiary veins are as well developed as Fiji New Australia the secondary veins and extend to the intramarginal vein. Caledonia Tropic of Capricorn Aneityum In open venation, the veins are more than 10 mm apart. In closed venation the veins are less than 10 mm apart. Map 1 Map of the Vanuatu archipelago. TAXONOMY Morphological terminology Syzygium Gaertn. The morphological terminology used here in the keys and de- Syzygium Gaertn., Fruct. 1 (1788) 166, t. 33. — Type: Syzygium caryophylla­ scriptions is more or less in accordance with those used by ceae Gaertn. authors in other regions. Most of the terms are well known but Tree or shrub glabrous throughout. Leaves opposite; lamina there are a few that need to be mentioned. margin entire; primary, secondary and tertiary venation distinctly Anthopodium — internode between the flower(s) and the pen- different or secondary and tertiary venation generally similar ultimate node of the inflorescence axis bearing the flowers with all or nearly all tertiary veins joining the intramarginal vein; (Briggs & Johnson 1977). primary vein (midrib) abaxially rounded, prominulous, adaxi- Calyptrate calyx — flowers with a cap formed from the peri- ally impressed; stipules absent.
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