Original Research

Speciation environments and centres of species diversity in southern Africa: 2. Case studies

G. E. Gibbs Russell, E. R. Robinson
Bothalia | Vol 14, No 3/4 | a1278 | DOI: https://doi.org/10.4102/abc.v14i3/4.1278 | © 1983 G. E. Gibbs Russell, E. R. Robinson | This work is licensed under CC Attribution 4.0
Submitted: 06 November 1983 | Published: 06 November 1983

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G. E. Gibbs Russell, Botanical Research Institute, Department of Agriculture, South Africa
E. R. Robinson, Department of Botany, University of the Witwatersrand, South Africa

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Abstract

Distributions of species in the grass genera Cymbopogon, Digitaria, Ehrharta and Stipagrostis are mapped to show that speciation within the phytochorion, where a genus has undergone major adaptive radiation (‘phytochorial sympatry’), may be differentiated from speciation in a phytochorion outside this characteristic one (‘phytochorial allopatry’). Testing of this hypothesis seems a fruitful field for systematists and will enhance our understanding of the flora.


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