118. Labiatae 215 



10. Anther-bearing stamens 2; calyx pubescent, lj-ner\cd, the 



teeth subulate 20. Blephilia 



6. Flowers in racemes, spikes, cymes, or solitary or few in th;> axils of 

 the lea\es. 



19. Flowers cyniosc ; leaves linear 18. Satureja 



19. Flowers not cymose. 



20. Calyx deeply 4-cleft; corolla greenish-yellow, 3-4 cm long; 

 flowers solitary, axillary; leaves thin, cordate, palmately 



veined, the blade shorter than the petiole 12. Synandra 



20. Calyx 5-toothed, or 2-lipped. 



21. Leaves reniform, crenate, petioled; stems trailing; flowers 



bluish-purple, axillary 9. Clecoma 



21. Leaves not reniform. 



22. Flowers 4-6 mm long. 



23. Leaves linear or lanceolate, entire or sparingly 



serrate; flowers bluish-purple; stamens 2 



22. Hedeoma 



23. Leaves ovate, purplish-green, coarsely dentate; 



flowers whitish; stamens 4 31. Perilla 



22. Flowers more than 6 mm long. 



24. Corolla with the upper lip apparently obsolete; 



stamens erect, exserted; flowers in long racemes 



1. Teucrium 



24. Corolla conspicuously bilabiate. 

 25. Leaves toothed. 



26. Flowers in loose terminal panicles; corolla 

 light yellow; fertile stamens usually only 2; 



calyx 2-lipped 30. Collinsonia 



26. Flowers not in loose terminal panicles. 

 27. Caly.x nearly equally 5-toothed. 



28. Flowers 1.5-3.5 cm long; spikes con- 

 tinuous, loosely flowered ; fertile 



stamens 4 10. Physostegia 



28. Flowers smaller. 



29. Stamens 2, long-exserted ; calyx 

 densely villous in the throat; 

 corolla purplish-pink, 5 mm 

 long; stem slender. stifT, corym- 

 bosely branched ; leaves ovate, 

 subsessile, sharply serrate, acu- 

 minate; i)lant very aromatic 



27. Cunila 



29. Stamens 4, not long-exserted ; 

 spikes composed of interrupted 



whorls of flowers 17. Stachys 



27. Calyx 2-lipped. 



30. Fertile stamens 2 ; corolla purplish 



19. Salvia 



30. Fertile stamens 4; corolla white 



23. Melissa 



25. Leaves (in our species) entire. linear, sessile or 

 nearly .so; flowers 1-5 in the axils; plants 

 often with short l);isal sterile stolons bear- 



