Original Research

Taxonomy of the genus Keetia (Rubiaceae-subfam. Ixoroideae-tribe Vanguerieae) in southern Africa, with notes on bacterial symbiosis as well as the structure of colleters and the ‘stylar head’ complex

P. M. Tilney, A. E. van Wyk
Bothalia | Vol 39, No 2 | a242 | DOI: https://doi.org/10.4102/abc.v39i2.242 | © 2009 P. M. Tilney, A. E. van Wyk | This work is licensed under CC Attribution 4.0
Submitted: 11 August 2009 | Published: 12 August 2009

About the author(s)

P. M. Tilney, Department of Botany and Plant Biotechnology. University of Johan­nesburg, South Africa
A. E. van Wyk, H.G.W.J. Schweickerdt Herbarium. Department of Plant Science, University of Pretoria

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Abstract

The genus Keetia E.Phillips has a single representative in the Flora of southern Africa region (FSA). namely K.  gueinzii (Sond.) Bridson. The genus and this species are discussed, the distribution mapped and traditional uses indicated. The structures of the calycine colleters, and the ‘stylar head' complex which is involved in secondary pollen presentation, are elucidated and compared w ith existing descriptions. Intercellular, non-nodulating, slime-producing bacteria are reported in leaves of a Keetia for the first time. Differences between the southern African representativ es o f Keetia, Psydrax Gaertn. Afrocanthium (Bridson) Lantz & B.Bremer, and Canthium s. str.. which for many years were included in Canthium s.I., are given.

Keywords

<i>Afrocanthium</i> (Bridson) Lantz & B.Bremer; anatomy; bacteria; <i>Canthium</i. Lam.; colleters. <i>Keetia</i> E.Phillips. <i>Psydrax</i> Gaertn.; Rubiaceae; taxonomy; Vanguerieae

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