LABIATAE 263 



. Ovary of 4 distinct or nearly distinct carpels, style basal : nutlets basally 



attached. 

 Calyx with a crest on the upper side or on the upper lip : lips 2, entire. 



4. Scutellaria. 

 Calyx without a crest on the upper side : lips not entire. 

 Stamens included. 5. Marrubium. 



Stamens exserted. 

 Corolla conspicuously 2-lipped ; lips different, the upper concave. 

 Anther-bearing stamens 4. 



Upper pair of filaments longer than the lower. 

 Anther-sacs parallel or nearly so. 

 Upper pair of stamens declined, lower pair ascending : erect 



herbs. 6. Agastache. 



Upper and lower pair of stamens ascending : trailing herbs. 



7. Meehania. 

 Anther-sacs diverging. 



Calyx barely 2-lipped, with 5 equal teeth : erect herbs. 



8. Nepeta. 

 Calyx 2-lipped, with unequal teeth : trailing herbs. 



q. Glecoma. 

 Upper pair of filaments shorter than the lower. 

 Calyx manifestly 2-lipped. 10. Prunella. 



Calyx merely with 3-10 teeth or lobes. 

 Tube of the calyx faintly nerved, inflated at maturity. 



II. Physostegia. 

 Tube of the calyx prominently 5-10-nerved, not inflated at 

 maturity. 

 Anther-sacs transversely 2-valved. 12. Galeopsis. 



Anther-sacs not transversely 2-valved. 

 Nutlets 3-sided, truncate above. 

 Calyx-teeth spine-tipped. 13. Leonurus. 



Calyx-teeth not spine-tipped. 14. Lamium. 



Nutlets nearly terete, rounded above. 15. Stachys. 



Anther-bearing stamens 2. 

 Connective of the anther elongated, bearing a perfect sac at one end 



and a rudimentary one at the other. 16. Salvia. 



Connective short : anther-sacs confluent. 

 Calyx not 2-lipped ; tube 15-ribbed ; lobes nearly equal. 



17. MONARDA. 



Calyx 2-lipped ; tube 13-ribbed ; lobes unequal. 



18. Blephilia. 

 Corolla regular or if 2-lipped, the upper lip flat or not concave. 



a. Flowers in axillary whorls or clusters ; these sometimes forming 

 terminal spike-like racemes. 

 Corolla 2-lipped. 

 Filaments curved, converging under the upper lip of the corolla. 

 Anther-bearing stamens 2. 19. Hedeoma. 



Anther-bearing stamens 4. 

 Corolla-tube strongly bent. 20. Melissa. 



Corolla-tube straight. 



Calyx with 5 nearly equal teeth, not 2-lipped. 



21. Satureia. 

 Calyx 2-lipped. 22. Clinopodium. 



