![[logo]](../../images/nhnlogo.gif)
BLUMEA BLUMEA[Top of this page] [Catalogue of publications] [NHN]
A taxonomic revision is made of the Neotropical genus Pseudoxandra. This genus forms part of the Cremastosperma alliance which consists of Bocageopsis, Cremastosperma, Ephedranthus, Klarobelia, Malmea, Mosannona, Onychopetalum, Oxandra, Pseudephedranthus, Pseudomalmea, Pseudoxandra, Ruizodendron, and Unonopsis, all from the Neotropics. Within Pseudoxandra 22 species are recognized, four of which were described quite recently by the first author (Maas et al., 1986). Fourteen species are described here as new. Two dichotomous keys are provided, one for the genera of the Cremastosperma alliance, and the other for the species of Pseudoxandra. The species treatments include descriptions, geographical and ecological notes, distribution maps, synonymy, taxonomic notes, and vernacular names. A complete index of exsiccatae is included.
Parallel to the taxonomic revision, a leaf anatomical survey was made by E.-J. van Marle. One of the intriguing features in Pseudoxandra is the frequent presence of minuscule warts on the leaves in dried specimens, while fresh material does not show any such warts. Osteosclereids found in the mesophyll of most species are probably responsible for this feature.
This revision is meant as a precursor for a future Flora Neotropica treatment of the integral Cremastosperma alliance. Revisions of Klarobelia, Malmea s.s., Mosannona and Pseudomalmea, once constituting the genus Malmea s.l., were published earlier by Chatrou (1998). Treatments of other genera are under way, or planned for the near future.
[Top of this page] [Catalogue of publications] [NHN]
Changes in generic concepts and delimitation resulted in 80 genera (6 of which are cultivated) of Philippine Rubiaceae. Generic descriptions of all genera are coded in DELTA format (Version 2000) and translated by the directive CONFOR into INTKEY database for interactive identification and information retrieval. The descriptions incorporate mostly compiled data of Philippine Rubiaceae species and observations on over 130 characters. Recently accepted classification (subfamily, tribes, and subtribes) and significant characters defined by Robbrecht (1988, 1993) are appended to the generic descriptions. The database is available on the World Wide Web at http://www.uni-bayreuth.de/departments/planta2/wgl/delta_ru/index.html.
[Top of this page] [Catalogue of publications] [NHN]
The genus Baijiania, originally thought to be indigenous in China and Borneo, appears to be restricted to Borneo. The only species is Baijiania borneensis, with two varieties, the type variety and var. paludicola Duyfjes, var. nov.
[Top of this page] [Catalogue of publications] [NHN]
A new species, Anoectochilus narasimhanii, allied to A. nicobaricus N.P. Balakr. & Chakr. from Saddle Peak National Park in North Andamans is described and illustrated. It is the first record of the genus from the Andamans. It grows on humus rich soil, in the shade of stunted evergreen vegetation at an elevation of ± 650 m.
[Top of this page] [Catalogue of publications] [NHN]
The position of Ficus subg. Pharmacosycea sect. Oreosycea and its subdivision are briefly discussed. A new subsection Glandulosae C.C. Berg is established. Five new species are described for the Malesian region: F. carinata, F. matanoensis, F. saruensis, F. sclerosycia, and F. subcaudata. Ficus pubinervis Blume and F. minor King are reduced to subspecies of F. nervosa Roth.
[Top of this page] [Catalogue of publications] [NHN]
Pollen of 57 species of Syzygium from SE Asia were surveyed by SEM. The grains are all ± triangular in polar view, uniformly small (mean diameter 10.4 µm) with few surface sculpturing features. All species examined exhibit a distinct apocolpium and, usually, apocolpial field. The presence of an apocolpial field cannot be linked to any known taxonomic grouping within the genus. It does not appear possible to distinguish the species of Syzygium on the basis of features of the pollen visible under SEM, though section Jambosa tends to have larger pollen with a proportionally larger apocolpium than species not in that section. Estimates for the number of pollen grains per stamen in species with larger pollen grains (± section Jambosa) are 5 time as great as for other species in the genus. TEM preparations showed the pollen surface to bear small supratectal processes and to be covered with pollenkit. The foot layer is well developed and more or less of the same thickness as the tectum. The columellae are of variable width and the endexine c. 0.05 µm thick. Various features of flower size are found to be positively correlated to pollen size. As large pollen grains are linked to large staminal numbers and large stamens (long filaments and large anthers) it is suggested that investigation of the breeding biology of section Jambosa is required.
[Top of this page] [Catalogue of publications] [NHN]
Fourteen species of Sauropus are recognised for Malesia, 21 for Thailand. Two species are described as new, S. asymmetricus of Sumatra and S. shawii of Borneo. Many new synonyms, especially for S. androgynus and S. rhamnoides, are provided. The latter two species have a much wider distribution than described before and both are difficult to separate from each other. A phylogeny based on morphological and palynological data proved futile, but showed that Sauropus together with Breynia and Glochidion are embedded in the paraphyletic Phyllanthus. Most species which formerly belonged to Synostemon and are now included in Sauropus are probably, with the exception of S. bacciformis, related to Breynia and Glochidion. Because of the poor phylogenetic results the circumscription of Sauropus is not changed (Synostemon still included), and an infrageneric classification is not provided.
[Top of this page] [Catalogue of publications] [NHN]
Derris Lour. is revised for the Flora Malesiana region. In the introduction comments are given on some characters and the seedlings of D. trifoliata Lour. are described. The introduction is followed by a section ‘Notes on species’ in which the varieties of D. elegans Graham ex Benth. are described, including a new one from Celebes (var. celebica Adema) and a new one from Malaysia, Java, Borneo, the Philippines and the Moluccas (var. korthalsiana (Blume ex Miq.) Adema). Several other species are discussed at some length. A key to the species of Derris in Malesia is presented. The paper concludes with notes on aberrant specimens and excluded species.
[Top of this page] [Catalogue of publications] [NHN]
Last modified april 24, 2006 by P. Hovenkamp.