LABIATAE. 27& 



**Corolla 2-lipped or regular; upper Up, when present, flat, or only slightly 



concave. 

 ■{Flowers in axillary, whorls or clusters, or these forming terminal spikes. 

 Corolla 2-lipped. 



Stamens curved, often, converging, or ascending under the upper lip 

 of the corolla. 

 Anther-bearing stamens 2. 19. Hedeoma. 



Anther-bearing stamens 4. 



Corolla-tube upwardly curved, exserted. 20. Melissa. 

 Corolla-tube straight. 21. CMnopodwm. 



Stamens straight^ often diverging. 



Calyx 15-nerved. 22. Byssopus. 



Calyx 10-l3-nerved. 



Anther : bearing stamens 4. 

 Anther-sacs divergent. 



Calyx equally 5-toothed ; erect herbs. 



2-3. Origanum. 

 Calyx 2-lipped; creeping herbs. 25. Thymus. 

 Anther-sacs parallel. 24. Koellia. 



Anther-bearing stamens 2. 26. Cunila. 



Corolla regular, 4-5-lobed. 



Anther-bearing stamens 2; plants not aromatic. 27. Lycopus. 

 Anther-bearing stamens 4: aromatic, fragrant herbs. 



' ' 28. Mentha. 



ft Flowers in terminal', panicled racemes or spikes; corolla S-lipped. 



Anther-bearing stamens 2; lower lip of the corolla long, fimbriate; 

 native. 29. uoJXinsonia. 



Anther-bearing stamens 4; lower lip of corolla not fimbriate; intro- 

 duced. 30. Perilla. 



1. TEUCEIUM L. Germander. 



Calyx canescent, the upper lobes obtuse. 1. T. Canadense. 



Calyx villous, the upper lobes acutish. 2. T. peridental/!, 



1. Teucrium Canadense L. American Germander, Wood Sage. M.. p. 782. 



Low grounds. Summer. 



2. Teucrium occidentals A. Gray. M. p. 782. Moist soil. Summer. 



Philadelphia— (P.) » 



2. ISANTHUS Michx. , 

 1. IsaNthus brachiatus (L.) B. S. P. False Pennyroyal; M. p. 782. 

 Sandy soil. Summer. 

 Philadelp hia— Schuylkill above Girard Avenue Bridge (Pr.). Bucks— 

 Nockamixon (Fr.), New Hope, Malta Island (Ws.). Montgomery— Shan- 

 nonville (Cr.). Chester — Phcenixville, I. Burk (He.). Lancaster— York 

 Furnace, Columbia (Wn.). Dauphin — (P.). 



Monmouth— Freehold (C). Mercer— Above Trenton (C.). Hunterdon, 

 —Tumble and Baven Bock (C). 



3. TEICHOSTBMA L. Blue-curls. Bastard Pennyroyal. . 



Leaves oblong or lanceolate; plant minutely viscid-pubescent. 



' l 1. T. dichotomum. 



Leaves linear; plant puberulent or glabrous. 2. I. lineare. 



1. Trichostema dichotomum L. M. p. 782. Sandy fields. Summer and 

 fall. 



