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Term Definition
Higher order leaf venation Referring to venation levels in the leaves above the tertiary veins.
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.