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Term Definition
Higher order venation All venation smaller in diameter than tertiary venation. Venation features of the black oak. Photo by S. A. Mori.
Order Referring to a level of taxonomic classification between family and division, i.e., an order is made up of families. The names of orders end in -ales, e.g., Caryophyllales and Lecythidales. Venation features of the black oak. Photo by S. A. Mori.