in the inside with a dark line of deep purple or blackish- 
een. 
etThis species moreover possesses the valuable property in India, 
of yielding a colouring matter of fine quality resembling Indigo, 
a property, however, which it has in common with Polygonum 
tinctorium, now “‘ extensively cultivated in Belgium as a domestic 
substitute for the tropical indigo,” and said to produce the dye 
in the greatest abundance, and of the finest quality. 
It will be seen by our figure 3, that the ovary is sunk in a 
cavity of the thick fleshy tube of the calyx. As this ovary ad- 
vances to maturity, the calyx closes over it, and forms a part of 
the fruit with its fleshy covering, so that Dr. Wight and others 
had referred the species to the genus Coccoloba. Dr. Lindley 
made it the type of a new genus Ampelygonum, but it is not 
generally adopted. — 
Fig. 1. Portion of the stem, and leaf, showing the ochrea and stipules,— 
natural size. 2. Flower,—magnified. 3. Vertical section of a flower,—more mag- 
nified. 
