ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1979.tb02570.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

The root anatomy of eight woody genera of the Caprifoliaceae cultivated in the British Isles was investigated. Special emphasis was placed on the characters that can most easily be used to identify roots from this family. These were found to be:(i) in the bark, the arrangement of phloem fibres or stone cells (if present) and (ii) in the xylem, the type (scalariform or simple) and shape of vessel perforation plates, type and arrangement of cells in rays and the presence or absence of spiral thickening (especially on fibre tracheids). Vessel characters were found to be inconstant in samples of some species grown in different environmental conditions.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1979.tb02571.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

An anatomical and morphological survey has been made of all 13 species of Gesneriaceae in Sri Lanka. Descriptions have been prepared of the leaves, petioles, and stems. Aeschyanthus ceyianica (Trichosporeae) has been found to closely resemble other species in the genus. Anatomically, Didymocarpui and Chirita are apparently closely allied to each other within the tribe Didymocarpeae, while Chamnpionia has several distinctive and interesting features. Rhynchoghssum and Epithema, both assigned to the tribe Klugieae, are less allied anatomically than they appear morphologically. Rhynchotechum (Cyrtandreae) shows features in keeping with its distinct taxonomic position. The possible significance of this type of comparative study is discussed.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1979.tb02572.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

The ecology and distribution of papyrus swamps are briefly reviewed together with the ecology, distribution structure and growth characteristics ofCyperus papyrus.Three age‐classes of culm are recognized and girth and density of each are recorded along transects through mree swamps in the Upemba Basin of Zaïre. A regression of culm‐unit biomass on culm girth, developed for Ugandan swamps, is used to convert Upemba measurements into biomasses. It is shown that simple measurements, taken at only a single point in time, yield much information on both the structure and the dynamics of papyrus populations.It is suggested that the standing‐crops of such populations are determined by available light, and by local temperature regimes, and are therefore constant, irrespective of site quality (nutrient status), for any particular climatic zone. Culm‐duration (life‐time) is not significantly influenced by climate and the ratio culms/rhizomes provides a useful indicator of comparative productivity. Unlike community biomass, productivity can be limited by si

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1979.tb02573.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Phyllotaxis in the mangrove genera of Rhizophoraceae is shown to be bijugate, the angle between orthostichies always less than 90d̀ and in some species close to one half the Fibonacci angle (68.8d̀). The same leaf arrangement occurs in both orthotropic shoots with extended internodes and in the crowded terminal rosettes of those branches which develop plagiotropy by apposition growth, and can be interpreted as an adaptive architectural feature in relation to mutual leaf shadin

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1979.tb02574.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1979.tb02568.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY