302 



BOTANY AND PHARMACOGNOSY. 



the United States and Canada, as well. The leaves contain oxalic 

 acid and acid oxalates. 



c. THE TROP^OLACEJ^] OR NASTURTIUM FAM- 

 ILY comprises but a single genus, Tropseolum. Some species 



Fig. 155. Geranium maculatum showing typical dicotyledonous flowers 

 and the 5-parted, reticulately-veined leaves. 



are cultivated for ornamental purposes and are the nasturtiums 

 of the gardens. The young shoots are succulent and taste like 

 some of the cresses, hence they have received the name " Indian 

 cress." They contain volatile constituents resembling those of 

 the Cruciferse, and in the leaves of Tropceolnm majus benzyl 



