Titlebook: Genus Medicago (Leguminosae); A Taxogenetic Study Karlis Adolfs Lesins,Irma Lesins Book 1979 Dr. W. Junk bv Publishers, The Hague 1979 Poll

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Isolating Mechanisms, Speciation, Evolution in ,, and Relationship to Other Generaxaploids are found in .. Most of the diploids are of the 2. = 16 type, with a basic chromosome number of x = 8; four species of diploids have 2. = 14 chromosomes and one has members with 2. = 16 and 2. = 14 chromosomes. The origin of the 2. = 14 types may be understood from the situation prevailing

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General Factors in Speciationin what we have in mind, visualize the following conditions: In our undulating countryside, bogs or small swamps have developed in depressions. Assume that a cross-fertilized species is growing in the surrounding mineral soil. It cannot establish itself in the swampland because it is adapted to cert

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Book 197900 mm; mild win­ ters for its 56°-58° N. Lat. , with January isotherms between -3° and -7° C; moderately warm summers, with July isotherms between 16° and 18° C), which together with its soils, mostly of acidic, podzolic type, is not well­ suited for alfalfa production. It was not until 1945 in Swed

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Notes to Items of Specific Parttics of macroscopic nature, related taxa may not be grouped together. Rather, some well-distinguishable characters such as straight versus coiled pods, or violet vs. yellow corolla, have caused separation of closely related species and putting together unrelated ones.

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Isolating Mechanisms, Speciation, Evolution in ,, and Relationship to Other Generavisualized. If and when a routine cytological method for quick screening of massive numbers of plants becomes available, the process might be more clearly understood. A most surprising finding was that a complete interbreeding barrier existed between these two chromosomally distinct types of plants,

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Relationship to Other Generar, indicates that, apart from cotyledon-type, most of those transfers fit into . in every sense. We agree with her, and in the foregoing discussion have indicated that some species treated here as . may actually belong to a separate genus or subgenus. Baum (l.c.) thought that he had found a characte