LABIATE. 163 



2. T. OCCidenta'le, Gr., is loosely pubescent, and the 

 calyx is villous with viscid hairs. S. W. Ontario. 



2. IS AX' THUS, Michx. FALSE PENNYROYAL. 



I. CSeru'leus, Michx. A low, branching, clammy-pubes- 

 cent annual. Leaves lance-oblong, 3-nerved, nearly entire. 

 Peduncles axillary, 1-3-flowered. Gravelly soil. 



3. HIEX'THA, L. MINT. 



1. M. vir'idis, L. (SPEARMINT.) Flowers in a narrow 

 terminal spike. Leaves ovate-lanceolate, wrinkled, veiny, 

 unequally serrate, sessile. Wet places. 



2. M. piperi'ta, L. (PEPPERMINT.) Flowers in loose inter- 

 rupted spikes. Leaves ovate or ovate-oblong, acute, petioled. 

 Plant smooth. Wet places. 



3. M. Canadensis, L. (WiLD MINT.) Flowers in axil- 

 lary whorled clusters, the uppermost axils without flowers. 

 Stern more or less hairy, with ovate or lanceolate toothed 

 leaves on short petioles. Var. glabra'ta, Benth. , is smooth- 

 ish, and has a rather pleasanter odour. Sandy wet places. 



4. M. sati'va, L. (WHORLED MINT.) Flowers in globular 

 clusters in the axils of leaves ; the uppermost axils not 

 flower-bearing. Leaves petioled, ovate, sharply serrate. 

 Calyx with very slender teeth. Atl. Prov. (Int. from Eu.) 



5. M. arvensis, L. (CORN MINT.) Flowers as in M. 

 sativa, but leaves smaller, obtusely-serrate, and teeth of the 

 calyx short and broader. Atl. Prov. (Int. from Eu.) 



4. LYC'OPUS, L. WATER HOREHOUND. 



1. L. Virgin'ieus, L. (BUGLE -WEED.) Calyx-teeth 4, 

 Uuntish. Stems obtusely 4-angled, 6-18 inches high, pro- 

 ducing slender runners from the base. Leaves ovate-lanceo- 

 late, toothed, Moist places. 



2. L. sinua'tUS, Ell. (L. Europ&us, var. sinuatus, Gray.) 

 Calyx-teeth 5, shar p- pointed. Stem sharply 4-angled, 1-3 

 feet high. Leaves varying from cut- toothed to pinnatifid. 

 Wet places. 



