Polyploidy in Trema (Ulmaceae)

Abstract

Cytomorphological studies of two species of Trema of family Ulmaceae revealed that T. orientalis with n=10 differed from the previous reports of n=18 and 20. In T. amboinensis, two cytotypes, one diploid (n=10) and the other 16-ploid (n=80) have been detected. The morphological differences possibly resulting from polyploidy have been brought out. The base number of the genus is suggested to be x=10.