LABIATAE. 



Vol. III. 



g. Mentha Cardiaca Gerarde. Small-leaved 

 Mint Fig. 3688. 



Men Ilia Cardiaca Gerarde ; Baker, Journ. Bot. 2 : 245. 1865. 



Pubescent or glabrate, often much branched, l}-2i 

 high, the upper branches ascending. Leaves lanceolate 

 to oblong-lanceolate or ovate-lanceolate, acuminate or 

 acute at the apex, the lower 2'-3' long, the upper much 

 smaller, all sharply serrate ; flowers whorled in the 

 upper axils; calyx-teeth subulate, about one-half as long 

 as the tube. 



Wet grounds, mostly along rivers and streams, Nova 

 Scotia to New Jersey, Pennsylvania and District of Colum- 

 bia. July-Sept. 



10. Mentha arvensis L. Corn Mint. Field 

 Mint. Fig. 3689. 



Mentha arvensis L. Sp. PI. 577. 1753. 



Perennial by suckers, pubescent or glabrate ; stems 

 erect or ascending, simple or branched, 6'-2 high, slen- 

 der. Leaves oblong-lanceolate, oval or ovate, petioled, 

 acute at the apex or the lower obtuse, crenate-serrate 

 with bluntish teeth, rounded at the base, l'-2*' long, 

 i'-l' wide, the upper not much smaller than the lower; 

 whorls of flowers all axillary, usually about equalling 

 the petioles ; calyx pubescent, campanulate, its teeth 

 triangular, about as long as the width of their base, 

 acute or sometimes obtuse, one-third as long as the tube. 



In dry waste places. New Brunswick to northern New 

 York, New Jersey, Pennsylvania and Florida. Also in 

 California and Mexico. Naturalized from Europe. Lamb's- 

 tongue. Wild pennyroyal. July-Sept. 



11. Mentha canadensis L. American Wild Mint. Fig. 3690. 



Mentha canadensis L. Sp. PI. 577. 1753. 

 Mentha borealis Michx. Fl. Bor. Am. 2: 2. 1803. 

 Mentha canadensis var. glabrata Benth. in DC. 

 Prodr. 12 : 173. 1848. 



Perennial by suckers ; stem more or less pubes- 

 cent with spreading or scarcely reflexed hairs, or 

 glabrate, erect, simple, or branched, usually slen- 

 der, 6'-2i high. Leaves oblong or ovate-oblong, 

 or oblong-lanceolate, slender-petioled, acute at the 

 apex, or the lower obtuse, sharply serrate, nar- 

 rowed to a somewhat cuneate acute or obtuse 

 base, glabrous or very sparingly pubescent, the 

 larger 2's' long, i'-l' wide; whorls of flowers 

 all axillary, often shorter than the petioles ; calyx 

 oblong-campanulate, densely or sparingly pubes- 

 cent all over, its teeth one-fourth to one-third as 

 long as the tube. 



In moist soil. New Brunswick to Manitoba, Brit- 

 ish Columbia, Virginia, Nebraska, New Mexico and 

 Nevada. Consists of several races, differing in 

 pubescence, leaf-form and size. Odor like Penny- 

 royal. July-Oct. 



