48 
Calyx with the 3 upper teeth more or less united in an 
( upper “lip,” which is deeply divided off from the 
2 lower teeth. 
Calyx thin and swollen, its lower teeth short and wide ; 
flowers very large and showy. 
Melit'tis Melissophyl’lum. 
Bn not swollen, its lower teeth narrow. 
‘Upper lip of corolla arched over the stamens. 
eae upper tooth of calyx very wide; flowers 
ab in a compact head. 
a 
x 
Prunella vulgaris. Se/f-heal. 
Central upper tooth of calyx minute or indis- 
tinguishable. 
e edie ias 
Upper lip of corolla straight or bent back. 
oe (or 2 of them) diverging ; usually pro-~ 
jecting beyond the corolla. | 
Thy'mus serpyllum. Wild Thyme. y 
ane converging in front of the upper lip of 
the corolla. } 
Calamin'tha 
| Calyx with 5 nearly similar teeth. 
oes (or 2 of them) diverging; calyx-teeth with 
| wide, bluntish points. j 
L Orig’‘anum vulga/re. Marjoram. 
Stamens ascending; calyx-teeth fine-pointed. 
Lower lip of corolla with 2 tooth-like projections 
f where the lateral lobes arise. } 
| Galeop’sis. 
~Corolla without such tooth-like projections. 
pale leaves divided into 3 or more lobes, ei 
| addition to the teeth. J 
Leon'urus Cardi'aca. MZotherwort. 
Leaves toothed merely. 
Calyx with 10 ribs and 10 deep, regular furrows 
from base to apex. } 
Ballo'ta nigra. L2lack Horehound. 
Calyx not deeply 10-furrowed. 
(One lip of corolla either yellow and 
3-lobed, or not yellow and with only a 
| minute, sharp, tooth-like lobe on each 
L side. La’mium. 
Lower lip of corolla not yellow, with the 
lateral lobes wider and usually rounded. 
Sta/chys. 
