The main vascular supply and support structure of a simple leaf-blade or leaflet, a continuation of the petiole, running the full length of the leaf.
The main rib or longitudinal vein (an externally visible vascular bundle) of a leaf or leaflet.
Central, major vein in a leaf, bract, petal, or sepal.
The main central vein of a leaf, the central stalk to which the leaflets of a pinnate leaf are attached.
The main central vein of a leaf; the central stalk to which the leaflets of a pinnate leaf are attached.