a basically palmate leaf in which the petiole extends into the lamina as a well-defined axis, dividing the lamina in two.
Copyright: Mike Bingham, Annette Willemen, Bart Wursten, Petra Ballings and Mark Hyde, 2011-17
Bingham, M.G., Willemen, A., Wursten, B.T., Ballings, P. and Hyde, M.A.
. Flora of Zambia: Glossary details: costapalmate.
http://www.zambiaflora.com/speciesdata/glossary-display.php?glossary_id=178, retrieved 27 March 2017