Leaves truncate or heart-shaped: this character refers to the outline of the leaf-base, and includes leaves which are cut straight across, heart-shaped or arrow-shaped at base:


Here some examples of leaves which are heart-shaped at base:






And here some examples of leaves which are cut straight across (truncate),or arrow-shaped (sagittate) at base:





The leaves which are not truncate or heart-shaped are rounded or tapering towards the leaf-stalk: