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Showing papers in "Botanical Journal of the Linnean Society in 1973"


Journal ArticleDOI
TL;DR: The genus Taraxacum is thought that the genus arose in the west Himalayas during the Cretaceous and that apomixis arose at an early stage by means of polyploidy, precocious embryony and asynapsis in the female meiosis.

191 citations


Journal ArticleDOI
TL;DR: The numerical classification based upon all 51 characters lends some support to the division of the genus into four principal groups of species: the East Asian pea pears, the larger-fruited East Asian p pear, the North African pears and the European and West Asian pears.

102 citations


Journal ArticleDOI
TL;DR: By a comparison of the ultrastructural features of the parenchymatous bundle sheath and the mesophyll it can be shown that the grasses can be divided into a number of groups roughly corresponding to those proposed by Brown, viz.

89 citations


Journal ArticleDOI
TL;DR: A fine-structural survey of three species of Prorocentrum and five species of Exuviaella has shown that there is no basic distinction between the two genera.

78 citations


Journal ArticleDOI
TL;DR: The velamen and exodermis of roots of 76 species of epiphytic orchids occurring in West Africa were examined and evaluated for the following characters; high correlation is reported between the number of velamen layers and taxonomic as well as habitat-tolerance groupings, together with lower correlation between the other characters evaluated.

77 citations


Journal ArticleDOI
TL;DR: Scanning electron microscopy has been used to examine the location and form of crystals in the stems of woody perennials and the results are discussed in relation to the effects of physical conditions and 'impurities' upon crystal form.

72 citations


Journal ArticleDOI
TL;DR: Chemical evidence generally supports Stevens' recent classification of the Ericaceae and indicates that Phyllodoce should be placed nearer to the Rhodoreae than in Stevens' system and that Cassiope and Harrimanella, placed together in theCassiopeae by Stevens, are distinctly different.

63 citations


Journal ArticleDOI
TL;DR: The species of Geranium show 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, which is presented and discussed in relation to Knuth's arrangement of the genus.

53 citations


Journal ArticleDOI
TL;DR: Investigations in Carex section Acutae confirm that C. juncella is conspecific with C. nigra and that north-west European plants of C. recta are actually interspecific hybrids of two types.

50 citations


Journal ArticleDOI
TL;DR: 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.

46 citations


Journal ArticleDOI
TL;DR: Comparative ontogenetic studies were made of the gametophyte generation grown from spores taken from natural populations of the four species of Sadleria and found that S. cyatheoides and S. souleyetiana have retained the capability for monogametophytic reproduction, whereas S. pallida has not.

Journal ArticleDOI
TL;DR: There are close similarities between Agave, Beschorneria and Furcraea, but Doryanthes differs widely from these genera, and sufficient anatomical differences exist to differentiate the Agave species examined.

Journal ArticleDOI
TL;DR: The effectiveness of the complementary arrangement of anthers and stigmas in promoting intermorph pollinations and in preventing pollen wastage in incompatible pollinations is discussed.


Journal ArticleDOI
TL;DR: The recognition of chemical races is discussed and it is concluded that where possible they should be based on diagnostic components, rather than on quantitative differences or the mere presence or absence of given compounds.



Journal ArticleDOI
TL;DR: Hexaploid chromosomal races of Globba cernua Bak and G. patens Miq have been analyzed both morphologically and cytologically in Malaya in this paper.

Journal ArticleDOI
TL;DR: Carpels in Choisya, Rufa, Poncirus and Citrus are peltate, and all instances exhibit an at least incipient syncarpy, and the floral axis is always involved in the central merging of the carpels.

Journal ArticleDOI
TL;DR: The nodal anatomy of Xanthophyllum is unilacunar with a single broad trace departing the cauline stele and of nearly uniform occurrence throughout the genus are extraordinary tracheoid foliar idioblasts, which are confined to the veins in terminal or subterminal positions.


Journal ArticleDOI
TL;DR: In several species of Solanum L. torvum, a shrubby weed widely distributed in the humid tropics, two forms of flower are noticeable in each inflorescence, and the term stylar heteromorphism is applied here, just to distinguish it from heterostyly in the traditional sense.

Journal ArticleDOI
TL;DR: Anatomical features of seeds of Prosopis farcata Eig, collected at nine localities from various geographical regions and habitats in Israel, were studied, finding that water penetration is apparently barred by the outermost wall layers of the external cells of the testa (palisade caps).



Journal ArticleDOI
TL;DR: The presence of a branched hair and the development of the cell plate from subterminal cells of the germination filament when the filament ends in a hair suggests a not very close relationship of Goniopteris with Meniscium and supports those authors who prefer generic distinction.

Journal ArticleDOI
TL;DR: The pistil of Colchicum is syncarpous, the carpels having open sutures or well-marked commissures and many bitegmic ovules of variable orientation, and there are usually three dorsal bundles and three alternate, septal bundles at the base of the pistil.


Journal ArticleDOI
TL;DR: A statistical evaluation of 47 species (6 genera) of the hemisyncarpous Wurmbaeoideae shows a significant tendency for bitegmic ovules and two simple septal bundles per septum to be associated with open sutures and for monotegmic eggs.

Journal ArticleDOI
TL;DR: Osbeck's conveyance of his collections, and Linnaeus's subsequent incorporation of the new species into his Species Plantarum, are illustrated.