212 LABIATAE. 



Corolla nearly regular. 



Anther-bearing stamens 2. 311. Lycopus, 212. 



Anther-bearing stamens 4. 



Corolla-lobes S. 312. Trichostema,213. 



Corolla-lobes 4. 313. Mentha, 213. 



Corolla irregular, distinctly 2-lipped. 



Anther-bearing stamens 2. 314. Ramona, 214. 



Anther-bearing stamens 4. 



Calyx with a protuberance on the upper 



side. 315. Scutellaria, 214. 



Calyx without a protuberance. 



Calyx-teeth 10, spiny. 316. Marrubium, 215. 



Calyx-teeth 5, not spiny. 



Calyx-teeth unequal, the upper one 



very large. 317. Dracocephalum, 215. 



Calyx-teeth almost equal. 



Calyx distinctly 2-lipped. 318. Prunella, 215. 



Calyx not 2-lipped. 



Upper corolla-lip flat. 



Plant creeping; flowers 



axillary. 319. Micromeria, 215. 



Plant erect; flowers in 

 whorled heads. 320. Madronella, 216. 



Upper corolla-lip concave. 

 Upper pair of stamens 

 longer than the 

 lower. 

 Anther-cells parallel. 321. Agastache, 216. 

 Anther-cells diver- 



gent. 322. Nepeta, 216. 



Upper pair of stamens 

 shorter than the 

 lower. 

 Throat of corolla di- 

 lated. 323. Lamium, 217. 

 Throat of corolla not 



dilated. 324. Stachys, 217. 



311. LYCOPUS. 



Low perennial herbs, glabrous or puberulent, not aromatic; 

 leaves sharply-toothed or pinnatifid ; flowers small, mostly white, 

 in dense axillary whorls; calyx bell-shaped, nearly equally 4- or 5- 

 lobed; anther-bearing stamens 2, distant; the upper pair either 

 sterile or wanting. 



Plants stoloniferous at base ; calyx teeth subulate. L. americanus. 



Plants not stoloniferous; calyx teeth triangular-cuspidate. L. lucidus. 



Lycopus americanus Muhl. Glabrous or puberulent; stems erect, simple 

 or little branched, 30-60 cm. high, from creeping rootstocks; leaves lanceolate 

 or ovate-lanceolate, acuminate or acute, cuneate at base, coarsely serrate or 

 sinuately incised, 2-5 cm. long; petioles short; flowers sessile, in dense axillary 

 whorl-liice clusters; bracts subulate; calyx-teeth triangular-cuspidate, stiff, 

 nearly as long as the small white corolla, exceeding the nutlets; sterile stamens 

 slender, with thickened tips. Low ground. 



