摘要:

In this study the anatomical features of leaves of 3 9 species of MalayanPandanus(Pandanaceae) are assessed, chiefly from the taxonomic approach. The results show that systematic foliar anatomy (chiefly epidermal and stomatal characters) is of considerable value at the infrageneric, supraspecific level, and that species‐clusters corresponding to sectional taxa can be recognized and denned. An infrageneric classification of the Malayan species based on anatomical data is presented. The composition of several generic sections is revised. Some sections appear very uniform, others are internally diverse, with respect to the anatomical features studied. Twelve sections are upheld in Malay

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1971.tb02151.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1971.tb02152.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

The external morphology and anatomy of the seeds of some 90 genera and some 200 species of the Cruciferae have been investigated. Emphasis has been laid on the relationships of seed structure to taxonomy. As regards seed anatomy, the testa is probably of greatest value in determining taxonomic relationships. Seed structure supports the Cruciferae as a natural taxon. In the present investigation, few genera and species show seed characters which are either exclusive or very distinct. Of the remainder, most genera are distinguishable from each other on a permutation of their macroscopic and microscopic seed characters. However it is difficult or impossible to distinguish between some genera on seed characters. The present investigation provides no support for tribal divisions within the Cruciferae.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1971.tb02153.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

Preliminary study shows the two species ofSararangato differ considerably in morphology and anatomy. The presence of stellate trichomes inS. philippinensisis a major character separating the two species; such trichomes are not found elsewhere in the family. Massive strands of thickened cells (buttresses) extend across the leaf ofS. sinuosubut appear absent fromS. philippinensis.The leaf anatomy of the latter more closely resembles that common inFreycinetia.The photosynthetic tissue is not clearly differentiated into distinct layers. Both species ofSararangahave unspecialized stomata. The presence of raphides in different structures in the two species may be distinctive. The pollen grains are ellipsoidal, with an intricate reticulate exine. The fruits contrast in structure with those ofPandanusandFreycinetiaand the seeds ofSararanga philippinensishave a characteristic elaborate testa.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1971.tb02154.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

Several female flowers were found on plants ofCymodocea serrulatacollected in Mida Creek, Kenya, during August 1969. The structure of the female inflorescence ofC. serrulata, previously known only from one fragmentary example, is described and shown to be very similar to that ofC. angustataOstenf. but different from that ofThalassodendron ciliatum.The occurrence of smallsquamulae intravaginalesin all leaf and bract axils in bothC. serrulataandT. ciliatumis described. Secondary male flowers were observed in the axil of the penultimate bract of about 10% of male inflorescences ofT. ciliatumcollected on the Kenya coast. The frequency of flowering and the factors affecting flowering in C.serrulataare discussed.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1971.tb02155.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY

摘要:

The morphology ofDioscorea sylvaticafrom Natal and the hills in the Lydenburg district of the Transvaal is described, as well as the anatomy of the leaf and stem. Differences were noticed between the Natal and Lydenberg types which are inconsistent with Burkill's classification of the species. From the differences it is suggested that the Lydenberg type be designated asD. sylvaticasubspecieslydenbergensissubsp. nov.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1971.tb02156.x

出版商:Blackwell Publishing Ltd    

年代:1971

数据来源: WILEY