154 A COMPENDIUM OF 
mens, the inner ones being sterile; four cells to 
each anther; seed solitary and about the size of 
awalnut. The bark from the Greenheart tree 
occurs in commerce in large, heavy, flat pieces, 
ranging from 6 to 12 inches (15 to 30 centime- 
ters); variable in breadth, but about \% inch (6 
millimeters) thick; of a gray-brown color extet- 
nally, and a shade or two darker internally; 
acter. The taste is astringent and persistently 
bitter. According to recent analysis, the bark 
the sulphate is from 2 to s grains (0.13 to 0.33. 
ies The name of the tree is after Dr. Ro- 
— » who was an earnest worker in the cause of 
botanical science, 
