`Mary`, a Dieffenbachia cultivar. `Mary` is a compact Dieffenbachia of medium size, with oval, yellow-green variegated leaves emarginated in dark green. The leaves are held tightly to the stem with distinctive short white petioles. `Mary` exhibits strong suckering ability. Its plant growth habit is small and compact, leaf shape is oval, leaf size is approximately 23 cm.times.14 cm with a length to width ratio of 1.6, leaves are yellow green and variegated, petioles are predominately white, and the distance from apex of wing to leaf base is small and bout 0.5 cm.