MINT FAMILY. 343 



<- +- Lobes of the corolla equally spreading ; filaments slightly projecting (or included) 

 from the notch between the "2 upper lobes. 



8. ISANTHTJS. Calyx bell-shaped, equally 5-lobed, enlarging after flowering. Corolla 

 only a little longer than the calyx, bell-shaped, with 5 equal spreading lobes. 



* * Stamens 4, reclining on the loioer lobe of the corolla, the ouier or lower pair 



longer ; anthers 2-celled. Corolla usually turned doicn or declining. Nutlets 

 smooth or smoothish, fixed by their base, as in all the following divisions, 



"- Calyx deflexed in fruit, 5-toothed, the upper tooth or lobe much broadest and some- 

 times wing-margined. 



4. OOIMUM. Corolla short, the upper lip as it were of 4 lobes, the lower of one entire flat 



or flattish declined lobe scarcely longer than the upper. Filaments separate. 



5. COLE US. Corolla similar to the last, but the lower lobe longer and concave or boat- 



shaped, inclosing the stamens and style ; filaments monadelphous. 



-- -t- Calyx little or not at all deflexed, and nearly regular. , 



6. HYPTIS. Calyx with 5 less unequal or equal teeth. Corolla of 4 short similar upper 



lobes, and a longer abruptly deflexed saccate lower one ; filaments separate. 



7. LAVANDULA. Calyx 13-15-nerved, 5-toothed, the upper tooth mostly larger. Corolla 



with tube longer than the calyx, regularly 2-lipped, i.e. upper lip 2-lobed, lower 

 3-lobed, the lobes all equally spreading. Stamens included, but declined towards 

 the lower lobe of the corolla. 



* * * 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 

 flat and spreading, or the upper erect but not arched. 



*- Flowers in large, loose terminal racemes or panicles. . 



8. COLLINSONIA. Calyx ovate, enlarging and turned down after flowering, 2-lipped, 



the upper lip flat and 3-toothed, the lower 2-cleft. Corolla elongated and irregular ; 

 the lower lobe or lip much the larger, pendent, 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. Cells of the anther diverging. 



9. PEEILLA. Calyx in flower 5-cleft, in fruit nodding and enlarging, becoming 2-lipped. 



Corolla short and rather bell-shaped, 5-cleft, the lower lobe a little longer. Stamens 

 4, nearly equal. Style deeply 2-cleft. 



4- -i- Flowers in clusters or whorls, or sometimes spicate. 



H- Corolla short and rather bell-shaped, hardly if at all 2-lippedi the 4 or rarely 5 lobes 

 nearly equal and all spreading. 



10. 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. 



11. LYCOPUS. Calyx 4-5-toothcd. Corolla with 4 about equal lobes. Stamens 2 ; he 



upper pair, if any, without anthers. 



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

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

 within; stamens with anthers only 2. 



12. CUNILA. 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 upper pair. 



13. 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. 



H- -M- -H- Corolla evidently 2-lipped. short, the upper lip erect or somewhat spreading 

 and nearly entire or notched, the lower spreading or o-cleft ; stamens with 

 anthers 4. _ 



HYSSOPUS. Calyx tubular, 15-nerved, equally 5-toothed. Corolla with the middle 

 ],obe of the lower lip larger and 2-cleft. Stamens very long and protruding. 



