having two or more leaf forms on the same plant either at once or at different times
• (a.) Having leaves of more than one shape on the same plant.
<botany> The presence on a single individual of two or more distinct leaf shapes. These leaves may differ markedly in shape, yet have similar gross anatomical organisation. ... (09 Oct 1997) ... 
Het`er·oph'yl·lous adjective [ Greek ... other + ... leaf: confer French hétérophylle .] (Botany) Having leaves of more than one shape on the same plant. 
having two or more leaf forms on the same plant either at once or at different times
Having leaves of different shapes on the same plant.