(50) 
a. Calyx 2-labiate. Stamens parallel. 
Prunella.—Calyx, closed in fruit. 
b. Calyx 5-dentate. Stamens parallel. 
Stachys.—Calyx 5-10-nerved. Lobes of 
the lower lip of the corolla obtuse. Sta- 
mens ascending. 
Sphacele.—Calyx reticulately veined. 
Lobes of the corolla 5, all obtuse. Sta- 
mens ascending, Shrub. 
ce. No ring of hairs in the corolla. 
Scutellaria.—Upper lip of the corolla 
concave. Stamens close together, paral- 
lel. Calyx 2-labiate, lips entire. 
Mentha.— Stamens distant and divergent, 
butstraight. Corolla funnel-shaped, 4- 
cleft, superior lobe emarginate. 
Micromeria.—Calyx teeth nearly equal. 
Stamens ascending. 
Monardella.—Stamens straight, diver- 
gent, exserted. Cells of the anthers at 
length also divergent. Corolla lobes 
narrow. 
Pycnanthemum.—Stamens straight, dis- 
tant, divergent. Cells of the anthers 
parallel to the last. 
Pogogyne.—Stamens ascending, con- 
vergent in pairs. Style villous. Calyx 
deeply 5-cleft. 
