Pinnate (odd): Leaflets are attached along an extension of the petiole called a rachis; there is a terminal leaflet and therefore an odd number of leaflets.
Twice pinnate: The leaflets are also divided into leaflets.
Pinnate (even): Leaflets are attached along an extension of the petiole called a rachis; there is an even number of leaflets.
Palmate: Leaflets are attached to the tip of the petiole.
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