in botany: A genus of the trigynia order, belonging to the dodecandra clas of plants. The calyx is half quadrifid, having the corolla above; the corolla quinquefied; the capsule unilocular, conjoined with the calyx.

DODECAHEON, in botany: A genus of the monogynia order, belonging to the pentandria clas of plants; and in the natural method ranking under the 21st order, Preciae. The corolla is verticillated and reflexed; the stamens placed in the tube; the capsule unilocular and oblong.