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Cytogeographical studies of Hyacinthaceae in Africa south of the Sahara
Author(s) -
Stedje B.,
Nordal I.
Publication year - 1987
Publication title -
nordic journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.333
H-Index - 33
eISSN - 1756-1051
pISSN - 0107-055X
DOI - 10.1111/j.1756-1051.1987.tb00916.x
Subject(s) - subgenus , biology , biological dispersal , cape , karyotype , out of africa , chromosome number , ploidy , botany , chromosome , geography , taxonomy (biology) , evolutionary biology , demography , archaeology , genetics , population , sociology , gene
The geographical distribution of different karyotypes in Tropical African genera of Hyacinthaceae is studied. In Albuca, Dipcadi, Drimia (including Urginea ), and Drimiopsis there seem to be a general trend of increasing level of ploidy and/or basic number. There is also a tendency of increasing karyotype asymmetry from the south towards north and west. Southern Africa is therefore probably a centre of dispersal (and origin?) for these genera. In the subgenus Urophyllon of Ornithogalum the cytological conditions are in accordance with a hypothesis of northern origin and migration via East Africa towards south and west. Several new chromosome numbers are presented.