Abstract
A survey of 480 collections of stem material of Philodendron has established five patterns of vascular organization. Species representing each of these patterns were analyzed by cinematographic methods to allow a three‐dimensional interpretation of the course of vascular bundles over extended distances. Pattern 1 has mainly collateral organization, but with some bipolar bundles. Pattern 2 has a majority of central bundles aggregated into compound (multipolar) bundles; Pattern 3 differs in that almost all bundles of the central cylinder are multipolar. Patterns 4 and 5 include compound vascular bundles in which the individual strands are not very discrete so that in Pattern 5, which is the most common in the genus, the bundles might be described as amphivasal. In Section Pteromischum, which has monopodial construction, the majority of species exhibit Pattern 2 which is exclusive to this group. Other correlations with subgeneric groupings are emphasized.
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