LABIATAE 165 



pointed.— Frequeut 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^^ 

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



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

 teeth lanceolate-subulate : heads villous-pubescent, ^"-1" 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 SheflQeld. 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. Virginicus. 



Basal stolons not present. 2. L. Americanus. 



1. L. Virginicus L. Bugle Weed. 1°-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 Hoakhound. 1°-2° high : leaves 

 ovate-lanceolate, sinuate-piunatifid, 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. L M. Canadensis. 

 Flowers spicate. 

 Leaves not white- woolly beneath. 



Leaves nearly sessile. 2. M. spicaia. 



Leaves petioled. 3. 31. piperita. 



Leaves white-woolly beneath. 4. 31. alopecuroidts. 



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. splcata L. Spearmint. 1°-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. Resembles 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 



