When the leaf blade is attached directly to the stem, that is, when there is no petiole, like here, the leaf is then called sessile. A petiolate leaf is attached to the stem by a petiole.

When the petiole is very short, the adjective used is subsessile (sub- means "under, below, or nearly...")

The term sheathing is used to describe a leaf blade or petiole that is prolonged into a tube that partially or completely surrounds the twig above the node to which the leaf is attached.