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Honolulu, HI, United States

Uromyrtus allisoniana and Rhodomyrtus takeuchii (Myrtaceae: Myrteae) are described as new species from ultrabasic substrates in the Kamiali Wildlife Management Area, Papua New Guinea. Both species are known only from the type gatherings, and each is tentatively assigned the status of " vulnerable" following IUCN criteria. Uromyrtus allisoniana resembles U. novoguineensis from New Guinea, but differs by its indumentum type, leaf size and apex, and its flush adaxial secondary leaf veins. Rhodomyrtus takeuchii resembles R. psidioides from Australia, but differs by its solitary flowers. An updated key is provided for the genus Rhodomyrtus. © 2010 President and Fellows of Harvard College. Source

Snow N.,Herbarium Pacificum | JFVeldkamp,Leiden University

Typifications are provided for Psidium cattleianum Sabine and P. guineense Sw. from Brazil and the Caribbean respectively. Episyzygium oahuense Suess. & A.Ludw. is confirmed as being a synonym of Psidium cattlieanum, not of Eugenia. Two varieties of P. cattleianum from Brazil are reduced to synonymy. New combinations are made in Gossia, Syzygium and Xanthomyrtus for a number of species from Malesia and Melanesia. For Syzygium these include S. thompsonii (Merr.) N.Snow (including Eugenia trukensis Hosokawa, syn. nov.) based on E. thompsonii Merr.; S. bifarium (Wall.) Veldk. based on E. bifaria Wall., which is neotypified; and S. melastomatifolium (Blume) Veldk., which is based on Jambosa melastomatifolia Blume. Xanthomyrtus kanalaensis (Hochr.) N.Snow comb, nov., based on E. kanalaensis Hochr., is the older and correct name for the endemic species on New Caledonia formerly known as X. hienghenensis Guillaumin. New combinations for Melanesian species of Gossia are provided, including G. alaternoides (Brongn. & Gris) N.Snow, G. alaternoides var. conspicua (Vieill. ex Guillaumin) N.Snow), G. alaternoides var. pulchrifolius (Guillaumin) N.Snow, G. aphthosa (Brongn. & Gris) N.Snow, G. clusioides (Brongn. & Gris) N.Snow, G. colnettiana (Guillaumin) N.Snow, G. diversifolia (Brongn. & Gris) N.Snow, G. kuakuense (Vieill. ex Guillaumin) N.Snow (an older name for a basionym for the species recently known in New Caledonia as Austromyrtus cataractarum), G. nigripes (Guillaumin) N.Snow, G. pancheri (Brongn. & Gris) N.Snow, G. vieillardii (Brongn. & Gris) N.Snow (which is shown to be the same taxon as the later named G. aneityensis (Guillaumin) N.Snow in Vanuatu), and G. virotii (Guillaumin) N.Snow. An expanded description based on fruiting material is provided for Rhodomyrtus kaweaensis N.Snow from Papua New Guinea. Taxonomic boundaries in the context of morphological and molecular variation are discussed for Rhodomyrtus montana Guymer and R. misimana N.Snow from New Guinea. Source

Snow N.,Herbarium Pacificum | McFadden J.,University of Northern Colorado | Evans T.M.,Grand Valley State University | Salywon A.M.,Arizona State University | And 2 more authors.
Systematic Botany

The monophyly of the genus Rhodomyrtus (Myrtaceae) was tested using data from morphology and the nuclear ribosomal ITS regions (ITS-1, ITS-2) and 5.8S gene. Representative species from baccate genera hypothesized to be closely related to Rhodomyrtus were included, such as Archirhodomyrtus, Octamyrtus, Knnakomyrtus, and some genera believed to be more distantly related, including Rhodamnia, Decaspermum, Pilidiostigma, and Myrtastrum. Up to four capsular-fruited outgroup species were used to root the trees (Heteropyxis natalensis, Carpolepis tardiflora, Lophostemon confertus, and Metrosideros rotundifolia). Morphological data using neighbor joining scattered species of Rhodomyrtus across several branches but generally recovered genera other than Rhodomyrtus. Using parsimony, the morphological data analysis also rejected the monophyly of Rhodomyrtus and resulted in consensus trees with relatively low resolution and bootstrap support. Based on traditionally recognized generic boundaries, results from DNA sequence data (parsimony, Bayesian analysis) rejected the hypothesized monophyly of Rhodomyrtus and typically dispersed species of Rhodomyrtus irregularly into two relatively large branches designated as Clades A and B. Species oher than Rhodomyrtus contained in either Clade A or B from the molecular results were some, but not all, members of Archirhodomyrtus, Octamyrtus, and Knnakomyrtus. Partition tests indicated that phylogenies based on morphological characters differed significantly from those based on molecular data so a combined analysis was not conducted. DNA sequence variation ranged from no variation among sequences within a species up to 61 base pair differences plus four 1 or 2 bp gaps between Rhodomyrtus misimana and R. mcmtana. Although results from morphological and molecular analyses reject the hypothesis that Rhodomyrtus is monophyletic, additional data are needed before Rhodomyrtus can be split confidently into demonstrably monophyletic genera. © Copyright 2011 by the American Society of Plant Taxonomists. Source

Tsuda R.T.,Herbarium Pacificum
Marine Biodiversity Records

Hormophysa cuneiformis, a brown macroalga in the family Sargassaceae, is now documented from Pohnpei based on a specimen collected in May 1957 and recently discovered in the Herbarium Pacificum of the Bishop Museum. Previously documented collections of H. cuneiformis in Micronesia were made from Palau in the western Pacific in July 1968 and January 1971, and Pagan Island in the Northern Mariana Islands in July 1975. © Marine Biological Association of the United Kingdom 2013. Source

Two new species of Syzygium are described from Madagascar: S. ludovicii and S. rakotovaoanum. They differ from other Malagasy members of the genus by virtue of their short (< 20 mm long) leaves and prominently winged branchlets. The species can be distinguished from one another based on morphological characters of the leaf and inflorescence. Each species is known only from the type collection. Following IUCN standards, a recommendation of Least Concern is given for S. rakotovaoanum, whereas S. ludovicii is recommended as Vulnerable. © 2010 President and Fellows of Harvard College. Source

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