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Incomplete rheophytic speciation in Pouchetia (African Rubiaceae - Hypobathreae)

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The small African genus Pouchetia contains a group which is at first glance recognizable because of the presence of tail-like, terminal 'synflorescences' ; these are the result of the modification of a large number of leaves into bracts. The group is extremely variable, however, especially because of transgression from diverse types of forest habitats to rheophytic conditions. A numerical analysis (hierarchical clustering, P.C.A. and two-dimensional plotting of characters) shows that phenotypically no clear-cut demarcation line can be traced between the populations of stenophyllous, miniaturized plants occurring in river-beds, and the populations of taller shrubs growing in other ecological conditions. The complex is considered to represent a single species {Pouchetia baumanniana, synonym P. gilletii) wherein no infraspecific categories can be recognized.
Originele taal-2Engels
TijdschriftBelgian Journal of Botany
Volume124
Nummer van het tijdschrift2
Pagina's (van-tot)137-151
Aantal pagina's15
ISSN0778-4031
StatusGepubliceerd - 1991
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