LAMIACEAE 



527 



Nutlets 3-sided, truncate. 

 Calyx-teeth not 



spiny-tipped. 13. Lamium. 



Calyx-teeth spiny- 

 tipped. 14. Leonurus. 

 Nutlets ovoid, rounded 

 above. 

 Calyx with a spread- 

 ing 5-toothed limb. 15. Ballota. 

 Calyx limb not 



spreading. 16. Stachys. 



Anther-bearing stamens 2. 



Connective of anther very long, bearing a 



perfect sac only at one end. 17. Salvia. 



Connective of anther very short, the sacs 

 confluent. 

 Calyx tubular, 15-nerved. 18. Monarda. 



Calyx ovoid-tubular, 13-ncrved, 2- 



lippcd. 19. Blephilia. 



Corolla 2-lipped or regular; upper lip when present 

 mostly flat, scarcely concave. 

 Flowers in axillary whorls or clusters or these 

 forming terminal spikes. 

 Corolla 2-lipped. 



Stamens curved, often converging. 



Anther-bearing stamens 2. 20. Hedeoma. 



Anther-bearing stamens 4. 



Corolla-tube upwardly curved, 



exserted. 21. Melissa. 



Corolla-tube straight. 



Calyx 10-nerved, about 



equally 5-toothed. 22. Satureia. 



Calyx mostly 13-nerved, 

 2-lipped. 23. Clinopodium. 



Stamens straight, often diverging. 



Calyx 15-nerved. 24. Hyssopus. 



Calyx 10-13 nerved. 



Anther-bearing stamens 4. 

 Anther-sacs divergent. 

 Calyx equally 5- 

 toothed; erect 

 herbs. 25. Origanum. 



Calyx 2-lipped ; creep- 

 ing herbs. 26. Thymus. 

 Anther-sacs parallel. 27. Koellia. 

 Anther-bearing stamens 2. 28. Cunila. 

 Corolla regular, 4-5 lobed. 



Anther-bearing stamens 2; plants not 



aromatic. 29. Lycopus. 



Anther-bearing stamens 4; aromatic, 



fragrant herbs. 30. Mentha. 



