TANÆCIUM, in botany: A genus of the angiosperma order, belonging to the didynamia class of plants; and in the natural method ranking under the 25th order, Putamineæ. The calyx is monophyllous, tubulated, truncated, and entire; the corolla long, monopetalous, and white; the tube cylindrical; the limbi erect, spreading, and nearly equal; the fruit a berry covered with a thick bark, large, oblong, internally divided into two parts; in the pulp are contained a number of seeds. There are only two species of this genus; the jaroha and parasicum, both natives of Jamaica. They grow by the sides of rivers, and climb on trees and bushes.