Original Research

Cytotaxonomic studies in African Asclepiadaceae

F. Albers
Bothalia | Vol 14, No 3/4 | a1244 | DOI: https://doi.org/10.4102/abc.v14i3/4.1244 | © 1983 F. Albers | This work is licensed under CC Attribution 4.0
Submitted: 05 November 1983 | Published: 06 November 1983

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F. Albers, Botanisches Institut der Universitát Kiel, Bi, Germany

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Abstract

The family Asclepiadaceae of about 290 genera is a homogeneous complex with complicated flower-structure. Little cytological data are available on the approximately 3 000 species in the family. The best studied subtribe is the Ceropegiinae (sensu Schumann, 1895) including the Stapelieae (as presently recognized) with its dominantly succulent members. Exactly half of the species are known karyologically. The basic chromosome number in the family is x = 11 and in most of the genera polyploid taxa are also to be found. The small size of the chromosomes makes individual identification very difficult and they form a graded series with very slight morphological differences. C-banding permits identification of heterochromatic regions; they all take up near centromeric positions. Therefore, studies aimed at an analysis of relationships with the aid of chromosome morphology on a lower taxonomic level, will hardly be possible. In so far as morphological characters of the inflorescence are concerned, diploid species of the genus Caralluma seem to form a species centre in South Arabia/East Africa.


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Crossref Citations

1. Cytological and morphological differentiation in Caralluma burchardii (Asclepiadaceae)
U. Meve
Nordic Journal of Botany  vol: 15  issue: 5  first page: 459  year: 1995  
doi: 10.1111/j.1756-1051.1995.tb00178.x