摘要:

The forest herbCorydalis cavais the only known species with a corm where tissue is added annually as a layer on the outside, and where the older central parts rot away, i.e. the corm becomes an expanding sphere. This growth pattern creates energetic problems for ageing plants. However, older corms change their shape in a way that saves biomass. Growth of corm with age was here modelled introducing different corm traits saving mass and thus postponing death. The largest corm in the study patch had a volume of 60 ml. If such a corm had remained a solid sphere, its age would be estimated to be 8.3 years. In reality, 4 year old corms became hollow and later an opening appeared in their basal part. In addition, corms ≥ 7 years became more conical. A conical corm with a volume of 60 ml was estimated to be 15.9 years old. Volume and shape of corm thus made it possible to age individual plants. The age structure of the plants in the study patch was described and discussed in relation to the overall dynamics of the metapopulation. The patch consisted of a few strong age classes (from 5 to 7 years old). Any recruiting juvenile age classes were almost completely missin

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1994.tb01771.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

An anatomical investigation of the leaves and twigs of Pterostemonaceae (Engl.), a monogeneric family of two species, has been made. The following anatomical characters in the leaf are of particular interest: glandular hairs, hydathodes on the marginal dentations and secretory substances in the glands and palisade cells. Characters of interest in the twig xylem include: vessel lumina of very small tangential diameter and with simple perforation plates; fibriform vessels with scalariform plates having one to six bars and also plates with perforations in irregular patterns.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1994.tb01772.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

Seeds of 12 species ofVeronicafrom south‐west Spain were examined with the scanning electron microscope and stereomicroscope. Based on seed shape, colour, cell shape and surface ornamentation, seven morphological types are recognized. Seeds of the different types are described, illustrated and compared. The distribution of seed types among taxa is given. A key to distinguish the different species or groups of species is provide

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1994.tb01773.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

Two distinct exine patterns were found among plants ofNicotianaxsanderae;studies of the F1 generation, and the F2produced by self and cross bud‐pollination showed one pattern to be recessive, the other dominant, perhaps controlled by two genes. The occurrence of the two patterns in these and other flowering plants and in spores of non‐flowering plants is discussed in relation to genie control of exine patt

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1994.tb01774.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

Fruits and Vegetables of the Caribbean, M. J. Bourne, G. W. Lennox and S. A. Seddon.Vascular Plant Families and Genera compiled by R. K. BrummittFlora iberica: plantas vasculares de la Peninsula Ibkica e Islas Baleares, volumes 3&4, edited by S. Castroviejo et al.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1994.tb01775.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1994.tb01776.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY