342 LABIATE. (MINT FAMILY.) 



Tribe I. A.TUGOIDE7E. Stamens 4, ascending (curved upwards) and parallel, usually 

 projecting from the notch of the upper side of the (not evidently 2-lipped) 5-lobed corolla. 

 Nutlets reticulated and pitted, obliquely attached by the inside near the base. 



* Lobes of the corolla all declined (turned forwards) : stamens exserted. 



1. Teucrium. Lower lobe of the corolla much larger than the others. Calyx 5-toothed. 



2. Tricliostema. Lobes of the corolla scarcely unequal. Calyx 5-cleft, oblique. 



* # Lobes of the corolla almost equally spreading : stamens nearly included. 



3. Isauthus. Calyx bell-shaped, 5-cleft, almost equalling the small corolla. 



Tribe II. SATUREIE^E. Stamens 4, the inferior pah- longer, or only 2, distant, 

 straight, diverging, or converging under the upper lip : anthers 2-celled. Lobes of the 

 corolla flat and spreading. 



* Corolla not evidently 2-lipped, but almost equally 4-lobed, small. Stamens erect, distant. 



4. Mentha. Fertile stamens 4, nearly equal. 



5. Lycopus. Fertile stamens 2 ; and often 2 sterile filaments without anthers. 



* * Corolla more or less 2-lipped ; the tube naked (not bearded) within. 



-i- Stamens only 2, distant : no rudiments of the upper pair. 



6. Cunila. Calyx very hairy in the throat, equally 5-toothed. Corolla small. 



i- 1- Stamens 4, all with anthers. 



7. Hyssopus. Calyx tubular, 15-nerved, naked in the throat, equally 5-toothed. Sta- 



mens exserted, diverging. 



8. Py cnanthemum. Calyx ovate or short-tubular, 10 - 13-nerved, naked in the throat, 



equally 5-toothed or somewhat 2-lipped. Flowers in dense heads or clusters. 



9. Origanum. Calyx ovate-bell-shaped, hairy in the throat, 13-nerved, 5-toothed. Sta- 



mens diverging. Flowers spiked, and with large colored bracts. 



10. Tliymus. Calyx ovate, nodding in fruit, hairy in the throat, 10 - 13-nerved, 2-lipped. 



Stamens distant. Bracts minute. Leaves very small. 



11. Satureia. Calyx bell-shaped, naked in the throat, 10-nerved, equally 5-toothed. Sta- 



mens somewhat ascending. 



12. Calamtntha. Calyx tubular, often hairy in the throat, 13-nerved, 2-lipped. Tube of 



the corolla straight. Stamens connivent at the summit in pairs under the upper lip. 



13. Melissa. Calyx tubular-bell-shaped, 2-lipped, flattish on the upper side. Tube of the 



corolla curved upwards. Stamens curved above, connivent under the erect upper lip. 

 )- - - Stamens only 2 with anthers, ascending, and a pair of small sterile filaments. 



14. Hedeoma. Calyx gibbous on the lower side, hairy in the throat. Flowers loose. 



* * * Corolla 2-lipped and with a bearded ring inside at the bottom of the enlarged throat. 



15. Collinsonia. Calyx enlarged and declined in fruit, 2-lipped. Lower lobe of the co- 



rolla much larger than the other four. Stamens 2 or 4, long, diverging. 



Tribe III. IION ARDE^E. Stamens 2 (sometimes also with mere rudiments of the 

 upper pair), ascending and parallel : anthers either apparently or really 1-celled. Corolla 

 2-lipped. 



16. Sal via. Calyx 2-lipped. Anthers with a 'long connective astride the filament, bearing 



a linear cell at the upper end, and none or an imperfect cell on the lower. 



17. Monarda. Calyx tubular and elongated, equally 5-toothed. Anthers of 2 cells con- 



fluent into one ; the connective inconspicuous. 



18. Blephilia. Calyx ovate-tubular, 2-lipped. Anthers as in the preceding. 



Tribe IV. NEPETEJE. Stamens 4, the superior (inner) pair longer than the inferior ! 

 ascending or diverging. Corolla 2-lipped ; the upper lip concave 9r arched, the lower 

 spreading. Calyx mostly 15-nerved. 



19. Lopb.anth.u8. Stamens divergent ; the upper pair curved downwards ; the lower as- 



cending : anther-cells nearly parallel. 



20. Nepeta. Stamens all ascending ; the anthers approximate in pairs ; the cells at length 



widely diverging. Calyx more or less curved. 



