MINT FAMILY. 353 



cymes; cymes sessile in the axils of the opposite leaves (rarely peduncled), 

 commonly dense and having the appearance of a whorl, and thus denominated 

 in the descriptions. Subtending leaves of the whorls frequently bract-like 

 and the internodes short, the inflorescence thus becoming spike-like, or the 

 whorl sometimes terminal and headdike. Calyx always synsepalous, frequently 

 bilabiate, usually 5-toothed. Corolla with a distinct tube, bilabiate, commonly 

 with 2 lobes in the upper lip and 3 lobes in the lower lip. Stamens inserted 

 on tube of corolla, 4, in 2 pairs, or the upper pair of stamens wanting or 

 represented by sterile filaments. Ovary superior, 4dobed (or 4-parted in 

 Trichostema), separating when ripe into 4 small 1-seeded smooth nutlets. Style 

 single, situated in the depression among the lobes of the ovary, cleft at apex. 

 Xutlets attached by the base (or by the side in Trichostema.) 



A. Ovary 4-lobed; nutlets attached at the side. 

 Calyx almost equally 5-cleft; corolla with elongated slender tube and 5 similar oblong 

 lobes, the 4 stamens protruded from the deep cleft of the upper lip, elongated and 



curved 1. Trichostema. 



B. Ovary 4-parted; nutlets attached at the base. 

 1. Calyx gibbous on the back. 

 Calyx with a gibbous or helmet-shaped protuberance on the back, the 2 lips entire; corolla 

 strongly bilabiate; flowers solitary in the axils of the opposite leaves.. 2. Scutellaria. 

 2. Calyx not gibbous on back. 

 u. Corolla bilabiate. 

 Calyx with 10 spinescent teeth hooked at tip; stamens included in tube.... 3. Marrubium. 

 Calyx-teeth not hooked at tip; stamens not included in the tube (not necessarily exserted 

 from corolla). 

 Upper pair of stamens longer than the lower. 



Stamens not exserted ; calyx irregular 4. Xepeta. 



Stamens exserted; calyx-teeth subequal 5. Lophanthus. 



Upper pair of stamens shorter than or equaling the lower, or wanting. 



Upper calyx-lip truncate, its margin with 3 cusps; flowers in a dense spike 



6. Bruxella. 

 Upper calyx-lip not truncate. 



Corolla-tube with a hairy ring within; calyx-teeth 5, equal, spine-tipped. . 7. Stachys. 

 Corolla-tube having no hairy ring. 



Calyx throat very oblique or with unequal teeth. 



Stamens with a filiform connective attached by the middle to the filament, or 

 at one end and the point of attachment indicated by an articulation or 



notch; anther-bearing stamens 2; perennials 8. Salvia. 



Stamens without filiform connective or articulation. 

 Annuals. 



Anther-bearing stamens 2 (or 4); bracts with very long awn-like spines... 



9. ACANTHOMINTHA. 



Anther-bearing stamens 4 (or 2); bracts merely ciliate 10. Pogogyne. 



Perennials; stamens (with anthers) 4; flowers in loose axillary clusters 



11. Melissa. 

 Calyx-teeth equal or nearly so. 



Flowers solitary; calyx-teeth short hairy or glabrous. 



Trailing herb 12. Micromeria. 



Low shrub 13. Sphacele. 



Flowers in dense whorls; calyx-teeth very woolly 14. Koellia. 



b. Corolla nearly regular. 



Flowers in terminal heads 15. Moxardella. 



Flowers in axillary whorls. 



Stamens 2 16. Lycopus. 



Stamens 4 17. Mentha. 



1. TRICHOSTEMA L. Blue Curls. 

 Ours ill-scented herbs with entire leaves and blue (occasionally pinkish or 

 whitish; flowers in axillary cymes or becoming raceme-like in age. Calyx 

 equally or almost equally 5-cleft. Corolla with oblique limb, the oblong lobes 



nearly alike; tube in ours slender, far exceeding the calyx and abruptly 



