By Professor V. H. Heywood (auth.), Prof. Dr. Klaus Kubitzki (eds.)
The unique recommendation to prepare a symposium concerning the classi fication and evolution of the Flowering crops was once made at, the overseas Botanical Congress at Leningrad in 1975, and the belief was once so good permitted via a number of colleagues that plans for this sort of symposium quick took form. An organizing committee which include Professor H. MERXMULLER, Miinchen, Professor V. H. HEYWOOD, studying, and Professor okay. KUBITZKI, Hamburg, used to be arrange. The convention happened on 7-12 September 197tl within the Institut fiir Allgemeine Botanik of the college of Hamburg lower than the auspices of the overseas organization for Plant Taxonomy and used to be at tended by means of eighty members from 14 nations. there were a number of conferences in recent times that have handled the beginning and evolution of the Flowering crops in order that it would be puzzled no matter if one more symposium facing roughly an identical topic have been rather "justified. because the reader will see from the contents of the e-book, this symposium differed from comparable ones held lately in respects: 1. Emphasis used to be given to methodological features of the category of upper taxa, and a couple of. a lot classificatory and evolutionary facts when it comes to the better taxa of Flowering vegetation was once presented.
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Extra info for Flowering Plants: Evolution and Classification of Higher Categories Symposium, Hamburg, September 8–12, 1976
3, 63-70. STEBBINS, G. , 1951: Natural selection and the differentiation of angiosperm families. Evolution 5, 2,99-324. - 1974: Flowering Plants. Evolution Above the Species Level. London: E. Arnold. , 1959: Die Evolution der' Angiospermen. Jena: Fischer. 1964: The taxa of the higher plants above the rank of order. Taxon 13, 160-164. 1969: Flowering Plants. Origin and Dispersal. Edinburgh: Oliver and Boyd. 1973: Evolution und Ausbreitung der Bliitenpflanzen. Stuttgart: Fischer. THORNE, R. , 1968: Synopsis of a putatively phylogenetic classification of the flowering plants.
The information contained in Table 1 includes, and also supplements, that which has been published elsewhere (SPORNE 1974, 1975, 1976a, CHENERY & SPORNE 1976). The purpose of this article is to examine the procedures that have been adopted during the assembling, analysis and interpretation of the data, the problems that have arisen and the extent to which subjective judgements have had to be made in their solution. Bearing in mind the lack of agreement among botanists as to the way in which monocotyledons stand in relation to dicotyledons, it was decided to treat the two groups separately, beginning with the dicotyledons.
In each, the broken lines indicate the survival of ancestral conditions, while the continuous lines indicate evolutionary changes 42 K. R. SPORNE: It has often been claimed, in discussions on evolution, that the commonest combination of characters within a group represents the primitive type for that group. However, the example just quoted shows clearly that this is not necessarily true. Character A could be a primitive one which has evolved so slowly that only 25% of the families have achieved the advanced state, A', while character B could be a primitive one which evolved so rapidly that only 20% have retained it.