98 LABIATiE. (mint FALnLY.) 



Connective longer than the filament itself, which it strides, a narrow anther- 

 cell at its upper end, a smaller one or a long process at the lower Salvia. 8 



Connective much shorter than the slender filament and continuous or barely 

 articulated with its apex, or apparently none; anther 1-celled, no rudi- 

 ment of the second cell below Audibertia. 9 



Tribe 3. Stachyde^. Stamens 4, with anthers, ascending and parallel imder the 

 concave or galeate upper lip of the corolla. Calyx 5-10-nerved. Herbage less aromatic 

 than the preceding tribes. 



Calyx with a projection on the upper side, casque-shaped Scutellaria. 10 



Calyx bilabiate. Filaments 2-f orked, one fork bearing the anther Brunella. 11 



Calyx 5-10-nerved, nearly equally 5-toothed Stachys. 12 



Tribe 4. Ajugoide^. Stamens parallel, and protruding from the cleft on the upper 

 side of the corolla; the anterior longer. 

 Corolla with 5 similar oblong lobes Trichostema. 13 



1. MENTHA, L. Mint. 



Calyx about equally 5-toothed. Corolla with a short included tube, and a campanulate 

 border; the upper lobe broadest, entire or emarginate. Odorous herbs, with very small 

 flowers in dense clusters forming an apparent whorl in the axils or spikate at the tops of 

 the branches. 



1. M. Canadensis, L. Leaves from oblong-ovate to almost lanceolate, sharply ser- 

 rate, acute, short-petioled; flowers all in axillary clusters, whitish or purplish. 



2, LYCOPUS, Tourn. Water Horehound. 



Chiefly distinguished from Mentha by the stamens. Flowers white, in false whorls. 

 1. L. lucidus, Turcz., var. Americanus, Gr. The subterranean runners producing 

 tubers; leaves lanceolate, 2 to 4 inches long, coarsely serrate, sessile or nearly so. 



3. PYCNANTHBMUM, Michx. 



Corolla short, with tube hardly exceeding the calyx. Anther-cells close and parallel. 

 Perennial erect herbs with small flowers, 



1. P. Californicum, Torr. About 2 feet high, corymbosely branched, sweet-odor- 

 ous, whitened with soft pubescence, or in age smoothish : leaves from ovate to ovate-lan- 

 ceolate, closely sessile by a slightly cordate or roundish base, sparingly denticulate or 

 entire; heads of flowers very dense at the summit, white-villous; flowers whitish. 



4. MONARDELLA, Benth. 



Marked by the flowers compacted in terminal heads involucrate with bracts, flesh-color 

 or purple. 



