Pennywort, also called dollarweed, is a summer perennial weed. The leaves of pennywort are round in shape, approximately 1 inch in diameter. The dark green leaves are glossy, with scalloped edges and are on long slender petioles. The petiole of pennywort is attached to the center of the leaf, not to be confused with dichondra in which the petiole is attached to the edge of the kidney shaped leaf.
Avoid excess moisture. Pennywort thrives in wet areas. Improved drainage may help to prevent infestation of pennywort.
Source: Virginia Polytechnic Institute & State University