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BLUMEA BLUMEA[Top of this page] [Catalogue of publications] [NHN]
A taxonomic revision of Dolianthus C.H. Wright (Rubiaceae–Psychotrieae) is presented, including a key to species, full descriptions, distribution maps, and a list of specimens examined. Eleven species are transferred from Amaracarpus to Dolianthus, resulting in ten new combinations. Two species are described as new to science: D. kairoi and D. ovatifolius. In total, thirteen species are included in Dolianthus. Dolianthus is endemic to the highlands (montane to subalpine and alpine zones) of Papua New Guinea.
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Two populations from Mount Kinabalu, Borneo, are recognised as two new subspecies of Lasianthus inodorus Blume (Rubiaceae), which occurs in montane habitats in mainland Southeast Asia, Sumatra and Java. The species and its subspecies are considered to compose a particular taxonomic group in the genus. Ecology and biogeography of the species group are discussed with the historical explanation of the tectonic history of Cenozoic Southeast Asia. The example strongly supports the concept of floristic connections between Malesia and mainland Southeast Asia.
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The taxonomy and ecology of the genus Hoya R.Br. are unclear, especially in the core area of its distribution: Sumatra, Borneo, Sulawesi and Irian Jaya. This paper summarises the available information on the ecology of Hoya species, and describes eight species from central Sulawesi. An important ecological trait of many Hoya species is their association with ants. Four types of mutualistic relationships with ants occur in the genus: 1) species with specialised leaves to house ants; 2) a single species that provides housing for ants under imbricate leaves; 3) species growing on the carton of ant nests; and 4) species that root in ant inhabited cavities in tree trunks and branches. Four of the eight described species grew in association with ants (types 2–4). Taxonomically, Hoya sussuela (Roxb.) Merr. is placed in synonymy with H. coronaria Blume, and H. maxima (H. Karst.) Warb. and H. pseudomaxima Koord. are reduced to H. imbricata Decne. Three new species are described.
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The leaf anatomical diversity of the genera Baccaurea Lour. (43 species), Distichirhops Haegens (3 species) and Nothobaccaurea Haegens (2 species) (Euphorbiaceae) is described. Two species of Aporosa and three species of Maesobotrya were examined for comparison. The following characters are important for the delimitation of species: hair types, the position of the glandular areas on the leaf margin, the hairiness and size of the glandular areas, the number of epidermal layers, the presence of (mucilage) idioblasts in the epidermis, the presence of palisade parenchyma above the vascular bundles, and the birefringence of the spongy parenchyma cell walls. However, leaf anatomy did not yield characters for distinction between the five genera studied. Phenetic analysis resulted in a grouping based on leaf anatomical similarities that corresponds to a large extent with the phylogenetic position of species based on a cladistic analysis of largely macromorphological features (Haegens, 2000).
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Two new species of Sauropus are described, both endemic to Thailand. The two species have long, cauliflorous inflorescences. Sauropus discocalyx has very broad staminate flowers and S. thyrsiflorus has thyrsoid inflorescences with per node a single pistillate flower and cymes with staminate flowers. A new combination for Glochidion subterblancum C.E.C. Fisch. (Breynia subterblancum (C.E.C. Fisch.) C.E.C. Fisch.) is made in Sauropus.
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The genus Margaritaria is revised for Malesia. Two species are recognised, one of these including two forms.
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Morphological and molecular studies are made on the fern genus Cheiropleuria, which was treated in the past as monotypic. We describe C. parva, a new species from Borneo, and separate C. integrifolia, distributed in Japan and Taiwan and probably in China too, from Southeast Asian C. bicuspis. The three species differ from each other in the size, shape and texture of lamina, di-vergence angles between lobes, frequency of bilobed leaves, and spore size and morphology. Cheiropleuria parva is distinct from C. bicuspis populations sympatric on Mt Kinabalu in the leaves of juvenile and adult plants, suggesting reproductive isolation. Nucleotide differences in the rbcL gene support separation of the three species.
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A revision is presented here of a group of mainly Papua New Guinea species of Medinilla Gaudich. ex DC. (Melastomataceae) peculiar for possessing a feature nearly unique for the family: leaf blades with a pair of lateral lobes at the base (‘pseudo-stipules’). This character was previously recorded for Astronidium miraculum-dei J.F. Maxwell & Veldk. (Astronioideae) from the nearby Solomon Islands. Various explanations, none satisfactory, for this phenomenon are explored. The group consists of 15 taxa, 2 previously described, 13 proposed here. The correct authorship of Medinilla is ‘Gaudich. ex DC.’, the correct name for the type species is Medinilla medinilliana (Gaudich.) Fosberg & Sachet, and not M. rosea Gaudich. ex DC., nom. superfl. Medinilla rubicunda (Jack) Blume var. hasseltii (Blume) Bakh.f. is validated. The descriptions of M. arfakensis Baker f. and M. brassii Markgr. are emended. A study of the palynology confirmed the homogeneity within Medinilla and among related genera.
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A new Rhysotoechia, R. etmanii, was recently discovered during botanical surveys of the Crater Mt. Wildlife Management Area in Papua New Guinea.
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A new species from the Krabi Province, Thailand, Barringtonia maunwongyathiae W. Chuakul, is described and illustrated.
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Microsorum thailandicum, a new species of Microsorum, is described and illustrated.
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The type specimen of Adelosa microphilla Blume has been examined and the results compared with the morphology of several other genera within the Labiatae. On the basis of this comparison it was concluded that Adelosa microphilla is most likely to be synonymous with a species of Clerodendrum L.
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New nomenclatural combinations are validated for Pseuduvaria oxycarpa (transferred from Mitrephora) and P. luzonensis, P. unguiculata and P. pamattonis (all transferred from Orophea). All names are lectotypified.
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A new species of Mitrephora is described from the swamp forests of Simeuluë Island, north-west of Sumatra. Mitrephora simeuluensis, spec. nov., is most closely related to M. korthalsiana Miq.
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The Parnassia (Parnassiaceae) from Mt Leuser in N Sumatra, provisionally known as Parnassia aff. wightiana, is described as Parnassia procul.
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Last modified april 24, 2006 by P. Hovenkamp.