摘要:

The external morphology of the six species is considered in detail, special attention being given to the branching System, flower form and the type of seed dispersal, which has often been misunderstood and has parallels among basidiomycete Fungi. In addition petiole anatomy is described, all species being different, and unpublished chromosome counts by other workers are reported (including 2n = 128 forG. canariense, a number erroneously reported earlier forG. palmatum).Crossing experiments (partly carried out by Mr W. Jackson) are described; the only successful new interspecific cross was G.maderensexG. palmatum.It is concluded that the six species, some of which are large pachycaul herbs endemic to Madeira or the Canary Islands, form an advanced group, and their affinities are discussed. A survey of other species with the same seed‐discharge mechanism, and of annual or biennial species, suggests that among the latter decrease in chromosome number has taken place along several different lines, and it is suggested that thèse lowered numbers have been combined by amphidiploidy to create new basic numbers in the genus. A formal taxonomic treatment of sectionsAnemonifoliaandRubertaincludes observations on infraspecific variation. An appendix reports the chromosome number ofG. cataractarumas 2n =

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1973.tb02551.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

The species ofGeraniumshow a wide range of flavonoid pattern, from one in which ail the regular (primitive) constituents are present to one where only quercetin and kaempferol are present. The primitive pattern predominates in the central Eurasian area, radiating eastward and westward from which the flavonoid constituents become progressivley impoverished. A “flavonoid score” providing a numerical estimate of this impoverishment is proposed. The results are presented and discussed in relation to Knuth's arrangement of the ge

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1973.tb02552.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

The leaf anatomy ofGoniothalamus andersonii, G. macrophyllus, G. malayanusandG. velutinusfrom the peat swamps of Sarawak is compared. Sufficient anatomical differences exist to differentiate the four species.G. velutinushas many points of difference from the other three species andG. macrophyllusis readily identified by the presence of fibre‐sclereids in the lamina mesophyll.G. andersoniiandG. malayanusare similar to each other, butG. andersoniican be distinguished, in particular by the more pronounced multiple projections of the outer periclinal walls of the epidermal cells and the presence of thick and cutinised outer ends of the anticlinal walls of the epidermal cell

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1973.tb02553.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY