434 DIDYNAMIA. 



torn of the calyx, 4, except in Fhryina, 

 which has a solitary seed. — Corolla mono- 

 petalous and irregular, a little inflated at 

 the base, and holding honey, -without any 

 particular nectary. Stamens in 2 pairs, 

 incurved, with the style between them, so 

 that the impregnation rarely fails. The 

 plants of this order are mostly aromatic, 

 and none, I believe, poisonous. The calyx 

 is either in 5 nearly equal segments, or 2- 

 lipped. Most of the genera afford excel- 

 lent essential characters, taken frequently 

 from the corolla, or from some other part. 

 Thus, Perilla has 2 styles, of which it is 

 an unique example in this class. 



Mentha a corolla whose segments are 

 nearly equal, and spreading stamens. Ejigl. 

 Bot. t. 446—8. 



Lavandula the Lavender, and Wes~ 

 tringia, Tracts on Natural History, 277? 

 t. 3, have a corolla resupinata, reversed 

 or laid on its back. 



Teucrium a deeply divided upper lip, 

 allowing the stamens and style to project 

 between its lobes. Engl. Bot t. 680. 



Ajuga scarcely any upper lip at all, 

 • t. 77 and 489- 



