Showing papers in "Blumea in 1974"

Wood anatomical variation in relation to latitude anf altitude

Abstract: The wood anatomical variation within 17 eurytherm hardwood genera in relation to altitude and latitude has been studied using wood samples from 52 species. With increasing latitude a miniaturization of secondary xylem elements (shorter vessel members, narrower vessels, shorter and sometimes narrower fibres, lower rays) is reported, together with an increase in vessel frequency and frequency and expression of helical thickenings to the vessel walls. Increasing altitude has similar but much weaker effects, and none on vessel grouping or helical thickenings. The number of bars per perforation plate in genera with partly or exclusively scalariform perforations is in general not correlated with altitude or latitude. In the softwood genus Podocarpus tracheid length and diameter and ray height decrease with increasing altitude. An analysis of the wood anatomical variation within 2 species with a wide latitudinal and 5 with a wide altitudinal range did not reveal correlations between the above mentioned features and latitude or altitude. The results are discussed with reference to previous interpretations of latitudinal and altitudinal variation in wood (Baas, 1973), stressing the significance for phylogenetic wood anatomy.

A revision of the family Leeaceae

Abstract: A world wide revision of the family with a general discussion of the systematic position, the affinities within the family, the morphology of leaves, flowers, and seeds, the chromosome number, and the geographic distribution. Types of ruminate endosperm of the seed, previously unknown in the family, are illustrated and new types of pearl glands of the leaves are described. A single genus with 34 species is recognized, 32 of which occur in the Indo-Malesian area and 2 are restricted to the Afro-Madagascan area. One new species from New Guinea is described. There is a key to all species, followed by descriptions of the non-Malesian ones and full synonymy of all taxa together with distribution data. A complete revaluation of specific characters has resulted in a new concept of the species, many forms and local species no longer being maintained.

The genera of tribe Passifloreae (Passifloraceae), with special reference to flower morphology

Abstract: A comparison of the structure of the flowers of various genera of the tribe Passifloraceae-Passifloreae supported the view of staminodial origin of the disk. The East African genus Schlechterina is kept separate from the West African genus Crossostemma. The genus Efulensia from Equatorial Africa is recognized beside the Madagascan genus Deidamia. Revised key to the genera of the Passifloreae, together with short descriptions.

A concise revision of the Flacourtiaceae of New Caledonia anf the Loyalty Islands

Abstract: A taxonomic revision of the Flacourtiaceae of New Caledonia incl. the Loyalty Islands, based mainly on the recently very enriched materials deposited in the Paris Herbarium. This resulted in a total of 53 species, belonging to 4 genera: Casearia, Homalium, Xylosma, and the endemic genus Lasiochlamys; 21 species and 1 variety were described as new and 5 new combinations were made.

A taxonomic revision of Dichelachne Endl. (Gramineae) with some new combinations in Stipa L. and Oryzopsis Michx

Abstract: Dichelachne was established by Endlicher in 1833 to accomodate a species collected by Ferd. Bauer in Norfolk I. Trinius and Ruprccht (1843) revised the genus, adding 6 more species, referring to previously published names, but giving new names as they had no access to the type materials of these. It has appeared that their specific concept was too narrow and in current literature only 4 species are accepted. This number has been reduced here to 3. Some other species have been placed in this genus now and then, but have proved to belong to different genera, as Deyeuxia, Agrostis, Stipa, and Oryzopsis. This shifting of species between quite different genera reflects the instability of the opinion about the taxonomic place of the genus. Some, as Trinius (1836), Trinius & Ruprecht (1843), F. v. Mueller (1873), and Pilger (1954) have considered it as a Stipea, others such as R. Brown (1810), Bentham (1878), Bentham & Hooker f. (1883), C. E. Hubbard (1934), and Miss Vickery (1961) have regarded it as an Agrostidea. Terrell (1971) placed it, together with Agrostis and Calamagrostis, in the Aveneae because of the presence of liquid endosperm. Although there is an overall resemblance to Stipa, closer inspection shows that it is very closely related to Deyeuxia of the Agrostideae in view of the dorsal, unarticulated, and simple awn, the microscopic, but sometimes well-developed rachilla-process which in Dichelachne crinita sometimes bears up to 3 florets, and the punctiform hilum. The difference with Deyeuxia is very slight, and mainly regards the lenght of the awn and the callus-hairs, as may be observed from the table.

Pacific capsular Myrtaceae 9. The Metrosideros Complex: M. queenslandica Group

Abstract: Metrosideros queenslandica L. S. Smith, Proc. Roy. Soc. Qld. 64 (1958) 50, is a species of the North Queensland rain forests mostly found above 1,000 metres altitude. Metrosideros omata C. T. White, Journ. Arn. Arb. 23 (1942) 79, another member of the group, occurs in rain forests of eastern New Guinea at 1,500 metres altitude and above. Probably some of the Metrosideros species described by Diels (1922) from New Guinea also belong to this group, but material of these has not yet been obtained.

Flowers and fruits in Flacourtiaceae. II. The seeds of Pangium edule Reinw

Abstract: The seeds are inferior. Only in the apical part of the seed the testa is integumental; for the greater part it is chalazal. A thick mesotesta is formed by a matted layer of sclereids. The chalazal part of the ectotesta is richly vascularized. A sheath of inverted vascular bundles occurs on the inside of the chalazal part of the mesotesta. The seeds are albuminous, the cotyledons foliaceous. An inside cavity may make the seeds float in water. The nucellar beak persists in the ripe seed. The endopyle is five-rayed in c.s., the ectopyle is a longitudinal slit.

A note on vessels in Hypolytreae of Cyperaceae

Abstract: In an earlier paper (Cheadle and Kosakai, 1972) on vessels in Cyperaceae we had available only two genera ( Chorizandra and Chrysithrix) and two species of the tribe Hypolytreae. This was unfortunate, for it turned out that Hypolytreae has the most primitive vessels on the whole. After reading the paper, Mr. Pieter Baas generously sent us fragments of roots, stem (culm), and leaves of the following additional genera and species of Hypolytreae: Hypolytrum compactum Nees & Mey. M 970 (rhizome also); H. nemorum (Vahl) Spreng M 969; Paramapania parvibractea (Clarke) Uitt. M 968; P. radians (Clarke) Uitt. M 971. After soaking in boiling water, the fragments were macerated and mounted in dilute glycerin for study. Camera lucida drawings were made of perforation plates and immediately adjacent walls for permanent record.

Account of Efulensia (Passifloraceae)

Abstract: The genus Efulensia C. H. Wright comprises two species in Equatorial Africa. One species, E. clematoides C. H. Wright, occurs in lowland forest from southern Nigeria to the eastern Congo basin, a second species, E. montana, here described as new, occurs in a restricted montane area in E. Zaire and W. Uganda. Genus and species descriptions, synonyms, key to the species, figures, and distribution map.

Florae Malesianae Praecursores LIV. Apocynaceae III

Abstract: Monograph: Monachino, Pacif. Sc. 3 (1949) 133—182. About 40 species, 2 in Central Africa, the others from India to SW. China and through the whole of Malesia till northern Australia, the Solomon Islands, New Caledonia, the New Hebrides, the Fiji-, Samoa-, Cook-, Society-, and Marquesas Islands.

Note on the genus Barteria Hook. f. (Flacourtiaceae or Passifloraceae)

Abstract: The discrimination of species in the genus Barteria has become more and more difficult with the increasing number of collections in recent years. To explain his treatment of the genus in the forthcoming 2nd part of the Flacourtiaceae in the ‘Flore d’Afrique Central (Zaire-Rwanda-Burundi)’, the author wants to discuss the diversity of characters found in the Barterias within the said flora, the area of which coincides more or less with the centre of distribution of the genus. The first species was described by Hooker f. under the name of B. nigritana from the coast of S. Nigeria. This species is bound to sandy soils of the beaches, to inner parts of the mangrove vegetation, and to littoral and sublittoral bush or forest, and is known along the coast from S. Nigeria to Fernando Poo, Cameroons, Rio Muni, Gabon, Cabinda, and the most western parts of Congo-Brazzaville and of Zaire. The petioles of B. nigritana are slender, its axillary inflorescences few-flowered.