Abstract
AbstractA comprehensive leaf architecture study of 31 species of Rhus s.str. was conducted to describe and identify characters of potential value for assessing infrageneric relationships. The first detailed leaf descriptions for Rhus subgenera are provided and show that cleared leaves revealed craspedodromous, eucamptodromous, and cladodromous venation types in the species studied. There was a diversity of terminal idioblasts associated with free simple or branched veinlets, and a unique combination of leaf organization, venation type, terminal idioblasts, and crystals allowed identification of subgenera and sections. Within the genus, species with toothed deciduous compound leaves exhibit a tendency to mostly craspedodromous venation with weakly sclerified tertiary veins and poorly developed terminal idioblasts; species with simple or compound evergreen leaves show mostly eucamptodromous and cladodromous venation with sclerified bundle sheath cells towards fifth‐order veins and well‐developed terminal idioblasts. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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