LABI AT AE. 273 



**Corolla B-lipped or regular; upper lip, when present, fiat, or only slightly 



concave. 

 ■fFlowers in axillary whorls or clusters, or these forming termiiial 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. Clinopodium. 



Stamens straight, often diverging. 



Calyx 15-nerved. 22. Hyssopus. 



Calyx 10-13-nerved. 



Anther-bearing stamens 4. 

 Anther-sacs divergent. 



Calyx equally 5-toothed; erect herbs. 



23. 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. 



f-f Flowers in terminal, panicled racemes or spikes; corolla 2-lipped. 



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

 native. 29. Collinsonia. 



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

 duced. 30. Perilla. 



1. TEUCRIUM L. Germander. 



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



Calyx villous, the upper lobes acutish. 2. T. occidentale. 



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



Low grounds. Summer. 



2. Teucrium occidentale 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. 

 Philadelphia— Schuylkill above Girard Avenue Bridge (Pr.). Bucks— 

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

 nonville (Cr.). C/ies«er— Phcenixville, 7. Burk (He.). Lancaster— York 

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



Monmouth— YveeholA {G.). Mercer— Above Trenton (C). Hunterdon 

 —Tumble and Raven Rock (C). 



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



Leaves oblong or lanceolate ; plant minutely viscid-pubescent. 



1. T. dichotomum. 

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



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

 fall. 



