The axis of a pinnate leaf or of an inflorescence.
The axis of a pinna in a bipinnate leaf.
The main stem (midrib, axis) of a compound leaf, the central axis of an inflorescence.
Elongated stalk of an inflorescence or extension of the petiole that carries the leaflets.
That part of a fern front stem bearing the leaflets, also called the axis; also, the main stalk of a flower cluster or of a compound leaf.
Part of the main axis of a compound leaf above the petiole that bears leaflets, or the main axis in an inflorescence above the peduncle that bears flowers.
In a compound leaf, the portion of the axis to which the leaflets are attached.