Trunk with large knob-like projections (which may bear thorns)
The following is a list of native or naturalised species which, at least some of the time, possess this spot-character.
Number of species: 10
Copyright: Mike Bingham, Annette Willemen, Bart Wursten, Petra Ballings and Mark Hyde, 2011-15
Bingham, M.G., Willemen, A., Wursten, B.T., Ballings, P. and Hyde, M.A.
. Flora of Zambia: List of species with each spot-character: Trunk with large knob-like projections (which may bear thorns).
http://www.zambiaflora.com/speciesdata/species-spot-display.php?species_id=101, retrieved 28 March 2015