MENTHACEAE. 311 



or 2-lipped, 5-toothed or 5-lobed, or rarely 4-toothed 

 or 4-lobed, persistent. Corolla mostly 2-lipped; upper 

 lip usually 3-lobed. Stamens inserted on the corolla- 

 tube, generally 4 and didynamous, sometimes 2 with 

 or without staminodia; anthers 2-celled, introrse or 

 confluently 1-celled. Ovary superior, 4-lobed or 4- 

 parted; style 2-lobed. Fruit of 4 1-seeded nutlets. 



Flowers solitary in the axils. 



Calyx gibbous on the upper side. 2. Scutellaria. 



Calyx not gibbous on the upper side. 



Trailing herbs; flowers small. 8. Micromeria. 



Shrubby; flowers large. 7. Sphacele. 



Flowers not solitary. 



Calyx regular or its teeth nearly equal. 



Stamens twice the length of the slender, 1. Trichostema. 



curved corolla. 

 Stamens not twice the length of the corolla. 

 Corolla nearly regular. 

 Flower-whorls axillary. 



Stamens 4. • 12. Mentha. 



Stamens 2. 11. Lycopus. 



Flowers in terminal bracteate heads. 9. Monardella. 

 Corolla evidently bilabiate. 



Stamens included in the corolla-tube. 3. Marrubium. 

 Stamens exceeding the corolla-tube. 



Lower pair of stamens the longer. 4. Stacha. 

 Stamens nearly equal. 10. Koelliys. 



Calyx bilabiate or its teeth unequal. 



Upper corolla-lip erect; filaments short; 

 the connective transverse, the lower 

 portion evident. 5. Salvia. 



Upper corolla-tip spreading; connective 

 nearly continuous with the filament, 

 the lower portion not evident or indi- 

 cated by a tooth. 6. Ramona. 



1. TRICHOSTEMA L. Blue-curls. 



Annual or perennial strong-scented herbs or rarely 

 shrubby, with lanceolate, oblong or linear, entire or 

 slightly repand leaves, and small or middle-sized, usu- 

 ally blue or purple flowers, paniculate or in axillary 

 loose or dense clusters. Calyx campanulate, very un- 

 equally 5-lobed. Corolla-tube slender, exserted or in- 

 cluded, the limb somewhat oblique and deeply 5-cleft 

 into oblong more or less declined segments. Stamens 4, 

 didynamous, ascending, curved, the anterior pair longer; 



