212 



LABIATAE. 



Corolla nearly regular. 



Anther-bearing stamens 2. . 

 Anther-bearing stamens 4. 

 Corolla-lobes 5. 

 Corolla-lobes 4. 

 Corolla irregular, distinctly 2-lipped. 

 Anther-bearing stamens 2. 

 Anther-bearing stamens 4. 



Calyx with a protuberance on the upper 



side. 

 Calyx without a protuberance. 

 Calyx-teeth 10, spiny. 

 Calyx- teeth 5, not spiny. 



Calyx-teeth unequal, the upper one 



very large. 

 Calyx-teeth almost equal. 

 Calyx distinctly 2-lipped. 

 Calyx not 2-lipped. 



Upper corolla-lip flat. 



Plant creeping; flowers 



axillary. 

 Plant erect; flowers in 

 whorled heads. 

 Upper corolla-lip concave. 

 Upper pair of stamens 

 longer than the 

 lower. 

 Anther-cells parallel. 

 Anther-cells diver- 

 gent. 

 Upper pair of stamens 

 shorter than the 

 lower. 

 Throat of corolla di- 

 lated. 

 Throat of corolla not 

 dilated. 



311. Lycopus, 212. 



312. Trichostema,213. 



313. Mentha, 213. 



314. Ramona, 214. 



315. Scutellaria, 214. 



316. Marrubium, 215. 



317. Dracocephalum, 215. 



318. Prunella, 215. 



319. Micromeria, 215. 



320. Madronella, 216. 



321. Agastache, 216. 



322. Nepeta, 216. 



323. Lamium, 217. 



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. 



Plants not stoloniferous; calyx teeth triangular-cuspidate. 



L. americanus. 

 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 

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

 whorl-like 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. 



