LABI AT AE 165 



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

 woods and prairies. June-August. 



2. K. Vlrginiana (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, i"-";" broad. — Fre- 

 quent througboat 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 corolIa>(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. Buglb 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. Watee Hoaehound. 1°-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-eleft. Stamens equal. 



Flowers all axillary. " 1. M. Canadensis. 

 Flowers spicate. 

 Leaves not white-woolly beneath. 



Leaves nearly sessile. 2. M. spicata. 



Leaves petioled. 3. M. piperita. 



Leaves white-woolly beneath. 4. M. 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. spicata L. Speaemint. 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. Pbppeemint. Resembles the last : spikes thick, 

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

 Infrequent. July-September. 



4. M. alopecutoidea Hull. Woolly Mint. 2° high, white-pubes- 

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



