A brief survey of types of branch attachment in monocotyledons shows a wide range of morphological possibilities. This diversity is duscussed in the light of recent analytical studies of the development of the vascular system in monocotyledons, expecially in the larger, woody forms which have a special interpretive appeal. Vascular interlinkage is seen here as the result of interaction between growth centers. Morphological diversity can accordingly be comprehended in quite simple developmental terms.