Original Research

Studies in the southern African species of Justicia and Siphonoglossa (Acanthaceae): indumentum

K. Immelman
Bothalia | Vol 20, No 1 | a894 | DOI: https://doi.org/10.4102/abc.v20i1.894 | © 1990 K. Immelman | This work is licensed under CC Attribution 4.0
Submitted: 16 October 1990 | Published: 18 October 1990

About the author(s)

K. Immelman, National Botanical Institute/Department of Agricultural Development, South Africa

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Abstract

The trichome types present on all species of Justicia and  Siphonoglossa in the southern African region (as defined by the Flora of southern Africa) were examined with the dissecting and with the Scanning Electron Microscope. Both glandular and eglandular trichomes were observed, the former comprising both sessile, peltate glands and stalked glands of various lengths. Eglandular trichomes are either straight or sharply bent (anvil-shaped), and comprise two to many cells. They are either smooth or have raised ornamentation on the cell walls. The presence and morphology of the trichomes on various organs is recorded and measured, and the range of trichomes seen was illustrated. The possible significance of trichome type and ornamentation in the taxonomy and ecology of the genera is discussed.


Keywords

Acanthaceae; <i>Justicia</i>; <i>Siphonoglossa</i>; trichomes; indumentum; southern Africa; taxonomy

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