LABIATAE 165 



pointed. Frequent throughout, especially in the southern part in dry 

 woods and prairies. June-August. 



2. K. Virginiana (L. ) MacM. Leaves linear-lanceolate, somewhat 

 pubescent : calyx tube triangular, merely acute : heads downy, often 6 X/ 

 broad. Frequent in dry woods throughout. June-August. 



3. K. pilosa (Nutt.) Britton. Leaves lanceolate, pubescent: calyx 

 teeth lanceolate-subulate : heads villous-pubescent, 4 // -7 // broad. Fre- 

 quent throughout in dry grounds. June- August. 



4. K. verticillata (Michx.) Kuntze. Resembles the last, but merely 

 puberulent : calyx teeth subulate. Dry soil near Sheffield. June-August. 



18. LYCOPUS L. 



Flowers in axillary clusters. Calyx (4-5-toothed) and corolla (4-lobed) 

 nearly equal in length. Anther sacs parallel. 



Basal stolons long and numerous. 1. L. Virginieus. 



Basal stolons not present. 2. L. Americanus. 



1. L. Virginieus L. BUGLE WEED. l-3 high : leaves ovate-lan- 

 ceolate, acuminate, petioled, serrate : calyx teeth four, shorter than the 

 mature nutlets. In wet woods along streams throughout. Locally fre- 

 quent. July-October. 



2. L. Americanus Muhl. WATER HOARHOUND. l-2 high : leaves 

 ovate-lanceolate, sinuate-pinnatifid, petioled : calyx teeth five, cuspidate- 

 pointed. Common in wet grounds. July-October. 



19. MENTHA L. 



Strongly scented herbs with white flowers in axillary or spicate whorls. 

 Calyx 5-toothed. Corolla 4-cleft. Stamens equal. 



Flowers all axillary. 1. M. Canadensis. 

 Flowers spicate. 



Leaves not white-woolly beneath. 



Leaves nearly sessile. 2. M. spicala. 



Leaves petioled. 3. M. piperita. 



Leaves white-woolly beneath. 4. M. alopecuroides. 



1. M. Canadensis L. WILD MINT. 6 / -2 high, pubescent to gla- 

 brate: leaves oblong-lanceolate, serrate, short petioled : calyx hairy all 

 over, its teeth subulate. Common throughout in moist grounds. July- 

 October. 



2. M. spicata L. SPEARMINT. l-2 high, glabrous : leaves oblong- 

 lanceolate, sharply serrate : spikes slim, narrow, the bracts usually con- 

 spicuous. Along brooks around Independence. Uncommon. July- 

 September. 



3. M. piperita L. PEPPERMINT. Eesembles the last : spikes thick, 

 dense, the bracts less conspicuous. Along brooks around Independence. 

 Infrequent. July-September. 



4. M. alopecuroides Hull. WOOLLY MINT. 2 high, white-pubes- 

 cent : leaves broadly oval, obtuse, sharply serrate, short-petioled : spikes 



