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Term Definition
Decussate A type of leaf placement in which opposite leaves at a node are arranged at right angles to the pair below and above them. Decussate leaf arrangement. Photo by S. A. Mori.
Decussate leaves Referring to opposite leaves arranged with each succeeding pair at right angles to the pairs below and above them. Decussate leaves and perfoliate stem. Photo by C. A. Gracie.