The leaves vary in color from bright green to dark green.

The leaves are similar to parsley, and vary from dark green to purple.

Even the leaves may vary from lanceolate to ovate within the same species.

The leaves vary in shape and size, the ones higher on the stem becoming smaller.

The blue-green leaves vary per species and are smooth textured.

The leaves can vary from a bright green to a bluish-green in color.

The leaves are heart-shaped and vary from 4-30 cm long in different species.

The leaves are opposite, simple, with entire margins, and vary from 5-20 cm (2-8 in).

The leaf stems also vary in size, from 5 to 20 cm long.

The leaves vary in width and length but are generally not more than 5 centimeters long.