1) Leafstalk 2) Petiole 
a leaf whose blade is much reduced or absent and whose petiole has assumed the functions of the whole leaf. adj. phyllodineous. cf. cladode
• (n.) Same as Phyllodium.
An expanded leaf which is actually bladeless and derived from a flattened petiole.
Phyl'lode noun (Botany) Same as Phyllodium . 
Type: Term Pronunciation: fil′ōd Definitions: 1. A flattened leaflike petiole; applied to any structure resembling a leaf, especially to a cross-section of a neoplasm with a foliated structure, such as cystosarcoma phyllodes.
[n] - an expanded petiole taking on the function of a leaf blade
noun an expanded petiole taking on the function of a leaf blade