Abstract
The stem vasculature of representative species of all but one of the 16 genera in the Philodendroideae was analyzed by films of series of cross sections, a technique only suitable for taxa with distinct internodes. Only one species in the large and very diverse genus Philodendron is described. Recognition of the subtribe Schismatoglottidinae as a natural group is supported by the presence of an endodermis around individual axial stem bundles in the genera examined but also occurs in Peltandra and Typhonodorum, which are distinct and isolated on other grounds. Aglaonema and Aglaodorum show a tendency to develop collateral bundles. Dieffenbachia is distinctive because compound bundles are developed. Consideration of other examples in which compound bundles have been observed allows comparative discussion of the topological characteristics of this bundle arrangement in the family as a whole. Clearly there is a continuum of structural possibilities.
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