522 POWDERED VEGETABLE DRUGS 



200. (Fig. 192.) TURNERA. Damiana. 

 Fl. ex. 30. ' 



The leaves of Turnera diffusa var aphrodisiaca Ward, and several 

 other species of Turnera, Turneraceae. _ 



Green; soon turning brown. 



Slightly aromatic. 



Somewhat pungent. 



Stomata on lower surface only. Vertical walls of epidermal cells 

 somewhat wavy, thin; cuticle thick with linear markings. Simple, 

 single-celled, somewhat bent and coiling, thick-walled trichomes with 

 cuticular markings. Abundant tissue with deep reddish brown resin. 

 Numerous aggregate crystals of calcium oxalate. 



Compare with T. diffusa, T. microphylla, and Aplopappus dis- 

 coidea (false damiana). 



