摘要:

A new system of classification of the angiosperms is presented. Like that of Dahlgren, 1975, it is shown as a two‐dimensional diagram or frame‐work, but differs in numerous major and minor features. In the new classification the angiosperms represent a class divisible into two subclasses corresponding to the di‐ and monocotyledons. The dicotyledons are divided into 24 ruperorders,viz. the Magnoliiflorae, Nymphaeiflorae, Ranunculiflorae, Caryophylliflorae, Polygoniflorae, Malviflorae, Violiflorae, Theiflorae, Primuliflorae, Rosiflorae, Podostemoniflorae, Fabiflorae, Proteiflorae, Myrtiflorae, Rutiflorae, Santaliflorae, Balanophoriflorae, Araliiflorae, Asteriflorae, Solanifloirae, Corniflorae, Loasiflorae, Gentianiflorae and Lamiiflorae, while the monocotyledons are divided into reven superorders, the Alismatiflorae, Ariflorae, Triuridiflorae. Liliiflorae, Zingiberiflorae, Commeliniflorae and Areciflorae. The higher categories are not defined here, but some general features in the classification are mentioned, and the distribution of some attributes is shown in the di

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1980.tb01661.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

The architecture of few rhizomatous plants has been studied in any morphological detail: a great many of those which have been studied show highly organized and repetitive branching patterns. These branching patterns are largely confined to three basic types: those based on a ± 60° branching angle, those based on a ± 45° branching angle, and those with a predominately linear component. These various configurations must confer certain advantages in terms of substrate exploration and exploitation. The consistent architecture of many rhizomatous plants permits predictive graphic simulation of the branching patterns, and also permits estimates to be made of productivity in terms of meristem/shoot accumulation. As a background to this structural consideration of rhizomatous plants, an extensive bibliography is presented in an appendix, covering all aspects ot rhizomatous and stoloniferous gro

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1980.tb01662.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

Features of the epidermis such as stomata, hairs, cork and silica cells are described from both light and electron microscope studies. The stomatal complex consists of two guard cells and two subsidiary cells. After division of the guard mother cell a pore is left at each end of the dividing wall. The cork and silica cells arise from a single another cell and develop differentially. The silica cell enlarges more than the cork cell and finally becomes filled with solidified silica. The outer tangential and radial walls of the cork cells become very thick‐walled, whereas the inner tangential and radial walls of the silica cells become thickened. The outer tangential wall of the silica cell remains thin and is covered with a thin layer‐ of cuticle. This wall frequently collapses in old cells leaving a depression in the surface of the stem. The change in the ultrastructure of the cork and silica cells are described and the possible functions of these cells discus

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1980.tb01663.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY

摘要:

Phytosociological data have been little used in taxonomy, but provide a wealth of ecological, chorological and taxonomic information which may be used in keys and descriptions. The phytosociological behaviour of taxa is a taxonomic attribute, subject to the same limitations as other characters. Its importance is based on the taxo‐syntaxon co‐evolution, co‐adaptation and co‐differentiation. A few examples in regard to the differentiation of some taxa by means ot syntaxonomic information are presented, comprising floristic, cytologic, edaphic, chorological, and other data. The interest of phytosociology for seed collection and banking, for the reintroduction of taxa and for the conservation of nature is emp

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1980.tb01664.x

出版商:Blackwell Publishing Ltd    

年代:1980

数据来源: WILEY