(50) 



a. Calyx %-labiate. Stamens parallel. 

 1. Prunella. Calyx, closed in fruit. 



b. Calyx 5-dentate. Stamens parallel. 



1. Stachys. Calyx 5-10-nerved. Lobes of 

 the lower lip of the corolla obtuse. Sta- 

 mens ascending. 



2. Sphacele. Calyx reticulately veined. 

 Lobes of the corolla 5, all obtuse. Sta- 

 mens ascending, Shrub. 



c. No ring of hairs in the corolla. 



1. Scutellaria. Upper lip of the corolla 

 concave. Stamens close together, paral- 

 lel. Calyx 2-labiate, lips entire. 



2 Mentha. Stamens distant and divergent, 

 but straight. Corolla funnel-shaped, 4- 

 cleft, superior lobe emarginate. 



3. Micromeria. Calyx teeth nearly equal. 

 Stamens ascending. 



4. Monardella. Stamens straight, diver- 

 gent, exserted. Cells of the anthers at 

 length also divergent. Corolla lobes 

 narrow. 



5. Pycnanthemuin. Stamens straight, dis- 

 tant, divergent. Cells of the anthers 

 parallel to the last. 



6. Pogogyne. Stamens ascending, con- 

 vergent in pairs. Style villous. Calyx 

 deeply 5-cleft. 



