244 MINT FAMILY. 



5. COLEUS. Calyx as in No. 4. Corolla similar, but the lower lobe longer and 



concave or boat-shaped, enclosing the stamens and style: filaments monadel- 

 phous. 



6. HYPTIS. Calyx with 5 less unequal or equal teeth. Corolla of 4 short simi- 



lar tipper lobes, and a longer abruptly deflexed saccate lower one; filaments 

 separate. 



7. LA\ ANDULA. Calyx not deflexed, 13-15-nerved, 5-toothed, the upper tooth 



mostly larger. Corolla with tube longer than the calyx, regularly 2-lipped, 

 i. e. lipper lip 2-lobed, lower 3-lobed, the lobes all equally spreading. Sta- 

 mens included, but declined towards the lower lobe of the' corolla. 



3. Stamens 4 (and the lower or outer pair longest) or 2, straight and distant or 

 diverging : anthers plainly 2-celled, not conniving in pairs. Lobes of the 

 corolla jiat and spreading, or the upper erect but iwt arched. 



* Corolla short and rather bell-shaped, hardly if at all 2-lipped, the 4 or rarely 5 



lobes nearly equal and' all spreading. 

 3. PERILLA. Calyx in flower 5-cleft, in fruit nodding and enlarging, becoming 



2-lipped. Corolla 5-cleft, the lower lobe a little longer. Stamens 4, nearly 



equal. Style deeply 2-cleft. 

 9. MENTHA. Calyx equally 5-toothed. Corolla with a 4-cleft border, the upper 



lobe a little broader and sometimes notched at the end. Stamens 4, nearly 



equal, similar. 



10. LYCOPUS. Calyx 4 -5-toothed. Corolla with 4 about equal lobes. Stamens 



2 : the upper pair, if any, without anthers. 



* * Corolla evidently 2-lipped, but all the lobes of nearly equal length, the upper lip 



erect and mostly notched, the lower spreading and 3-cleft, the tube not bearded 

 within : stamens with anthers only 2. 



11. CUNTLA. Calyx equally 5-toothed, striate, very hairy in the throat, one half 



shorter than the corolla. Stamens 2, long and protruding: no rudiments of 

 the other pair. 



12. HEDEOMA. Calyx 2-lipped, gibbous on the lower side near the base, hairy 



in the throat. Corolla short. Stamens 2, with anthers scarcely protruded, 

 and 2 sterile short filaments tipped with a little head in place of anther. 



* # * Corolla elongated and irregular : the lower lobe or lip much the larger, pen- 



dent, cut-toothed or fringed, the 4 others nearly equal and alike: tube with a 

 bearded ring inside at the bottom of the enlarged throat : stamens 2 with 

 anthers or rarely 4. 



13. COLLTNSONIA. Calyx ovate, enlarging and turned down after flowering, 



2-lipped, the upper lip flat and 3-toothed, the lower 2-cleft. Cells of the an- 

 ther diverging. 



* # # * Corolla evidently 2-lipped, short, the upper lip erect or somewhat spread- 



ing and nearly entire or notched, the lower spreading or 3-cleft : stamens with 

 antiiers 4. 



14. HYSSOPUS. Calyx tubular, 15-nerved, equally 5-toothed, naked in the throat. 



Corolla with the middle lobe of the lower lip larger and 2-cleft. Stamens 

 very long and protruding. 



15. PYCNANTHEMUM. Calyx oblong or short-tubular, about 13-nerved, equally 



5-toothed or somewhat 2-lipped, naked in the throat. Corolla with the lobes 

 of the lower lip ovate and entire. Flowers crowded in heads or close cymes. 



16. ORIGANUM. Calyx hairy in the throat, about 13-nerved. Lower lip of the 



corolla of 3 similar lobes. Flowers crowded into spike-like clusters and fur- 

 nished with imbricated often colored bracts. 



17. THYMUS. Calyx ovate, hairy in the throat, 13-nerved, 2-lipped; the upper 



lip 3-toothed and spreading, the lower cleft into 2 awl-shaped ciliate lobes. 

 Corolla not strongly 2-lipped, the upper lip resembling the 3 lobes of the lower 

 lip but notched at the apex. Stamens mostly protruding. 



18. SATUREIA. Calyx bell-shaped, naked in the throat, 10-nerved, equally 



5-toothed. Corolla with lower lip of 3 nearly equal entire lobes. Stamens 

 somewhat ascending. Leaves narrow. 



4. Stamens 4 (the lower or outer pair longer), ascending or curved and with the 

 plainly 2-celled anthers approximate or conniving in pairs under the erect and 

 Jluttisn but not arched upper lip. Calyx more or less 2-lipped. 



19. CALAMINTHA. Calyx not flattened. Corolla straight, with inflated throat, 



and 2-lipped border,' the spreading lower lip 3-parted, its middle lobe entire 

 or slightly notched. 



