Pereskia clade B marks the beginnings of an evolutionary switch to using stems as photosynthetic organs.

The photosynthetic organs of Asparagus have been the subject of some controversy; however, most authors consider them to be flattened stems rather than leaves (phylloclades).

They have leafless (or apparently leafless) flattened stems which act as the plant's photosynthetic organs.

They are leafless, the green stems acting as photosynthetic organs.

Leaves are the primary photosynthetic organs of a plant.

The stems are green, and almost wholly replace the leaves as the plant's functioning photosynthetic organs.

The nara plant is leafless, the modified stems and spines serve as the photosynthetic "organs" of the plant.

In the big form the living part is the tap root and the photosynthetic organs around the base.

The main advantage of the evergreen habit is that the plant does not have to expend energy on new photosynthetic organs each year.

Leaf - the photosynthetic organ of a plant that is attached to a stem, generally at specific intervals.