132 Dunn— A Key to the Labiatae 



26. Upper lip of corolla much shorter than the 

 lower, bifid or o 

 Upper lip as long as, or longer than, the 



lower, entire .... 

 27. Flowers minute, in crowded cymes . 



Flowers of moderate size, spiked or racemed 



31. 



35. Craniotomy 

 28. 



28. Stamens included .... 

 Stamens exserted .... 



33. Chelonopsis. 

 29. 



29. Flowers in dense woolly spikes 



Flowers in racemes .... 



52. Leucosceptrum. 

 30. 



30. Upper lip of corolla entire or emarginate . 

 Upper lobes of corolla 2 or 4, equal 



53. Ajuga. 

 51. Teucrium. 



31. Flowers in small corymbed spikes . 

 Inflorescence not corymbose 



22. Origanum. 

 32. 



32. Leaves small entire .... 

 Leaves moderate or large, crenate or serrate 



33- 

 34- 



33. Calyx bilabiate .... 

 Calyx teeth equal .... 



. 23. Thymus. 

 24. Micromeria. 



34. Stamens 2, anthers on long-equitant connecti 

 Stamens 4 . 



ve . 27. Salvia. 

 35- 



35. Calyx 13-15-nerved .... 

 Calyx 5-10-nerved .... 



- 36. 

 40. 



36. Calyx bilabiate .... 

 Calyx teeth equal and sinuses equal 



37- 

 39- 



37. Bracts bristle - like ; corolla tube hardly 



exserted .... 



Bracts broader or corolla tube far exserted 



25. Calamintha. 

 ■ 38. 



38. Calyx with 5 distinct veins, others obscure . 

 Nerves of calyx 15 distinct . 



26. Melissa. 

 30. Dracocephalum* 



39. Flowers in dense terminal spikes without 



Flowers in loose inflorescences or with con- 

 spicuous bracts .... 



40. Stamens included in corolla tube 

 Stamens exserted .... 



28. Lophanthus. 



29. Nepeta. 



41. 



42. 



41. Leaves inciso-lobate 



42. Upper lobe of calyx broad, winged . 

 Calyx lobes subequal 



34. Marrubium. 

 33. Chelonopsis. 



43- 



n of Dracocephalum from Nepeta was recognised by Linnaeus 

 most subsequent botanists as depending upon the bilabiate form of the 

 : in the former, the latter having 5 equal calyx teeth. The irregularity of 

 ilabiate calyx of Dracocephalur,: consists m ether (1) having one broad upper 

 and 4 small narrow ones below, or (2) having 3 teeth united nearly to the 



