LABIATAE. 



Vol. III. 



3. Mentha citrata Ehrh. Bergamot Mint. 

 Fig. 3682. 



Mentha citrata Ehrh. Biitr. 7 : 150. 1792. 



Perennial by leafy stolons, glabrous throughout; 

 stem weak, branched, decumbent or ascending, I -2 

 long. Leaves petioled, thin, ovate or ovate-orbicular, 

 obtuse or the upper acute at the apex, rounded or 

 subcordate at the base, sharply ^ serrate with low 

 teeth, the larger about 2 long, l'-li' wide; whorls 

 of flowers in terminal dense thick obtuse spikes, and 

 commonly also in the uppermost axils ; spikes scarcely 

 more than 1' long in fruit : calyx glabrous, its teeth 

 subulate, one-half as long as the tube, or longer; 

 corolla glabrous. 



In wet soil, Connecticut to New York, Ohio, Michigan 

 and Missouri. Naturalized from Europe. Also in Ber- 

 muda and Porto Rico. July-Sept. 



4. Mentha longifolia (L.) Huds. Horse 

 Mint. Fig. 3683. 



Mentha spicata vax. longifolia L. Sp. PI. 576. 1753- 

 Mentha longifolia Huds. Fl. Angl. 221. 1762. 

 Mentha sylvestris L. Sp. PI. Ed. 2, 804. 1763. 



Perennial by suckers, canescent or puberulent 

 nearly all over; stems mostly erect, branched, or 

 simple, I-2i high. Leaves lanceolate, ovate- 

 lanceolate, or oblong-lanceolate, sessile, or very 

 short-petioled, acute at the apex, usually rounded 

 at the base, sharply serrate. 1-3' long, J'-i 1' wide, 

 sometimes glabrous above; whorls of flowers in 

 terminal narrow dense or interrupted acute spikes, 

 which become 2-5' long in fruit; bracts lanceo- 

 late-subulate, the lower equalling or longer than 

 the flowers ; calyx tomentose or canescent, its 

 teeth subulate, one-half as long as the' campanu- 

 late tube; corolla puberulent. 



In waste places, Connecticut to Delaware, New Jer- 

 sey and Ohio. Naturalized from Europe. Brook- or 

 fish-mint. Water or European horse-mint. July-Oct. 



5. Mentha rotundifdlia ( L.) Huds. 

 Round-leaved Mint. Fig. 3684. 



Mentha spicata var. rotundifolia L. Sp. PI. 576. 



1/53- 

 Mentha rotundifolia Huds. Fl. Angl. 221. 1762. 



Perennial by leafy stolons, canescent or 

 tomentose-puberulent, somewhat viscid ; stems 

 ascending or erect, simple or branched, usu- 

 ally slender, li-2i high. Leaves elliptic, or 

 ovate-oblong, short-petioled, or sessile and 

 somewhat clasping by the subcordate or 

 rounded base, obtuse at the apex, crenate- 

 serrate with low teeth, i'-sz' long, 0/-15 

 wide, more or less rugose-reticulated be- 

 neath ; whorls of flowers in terminal dense 

 or interrupted spikes which elongate to 2-4' 

 in fruit; bracts lanceolate, acuminate, com- 

 monly shorter than the flowers; calyx-teeth 

 setaceous, usually about one-half as long as 

 the tube ; corolla puberulent. 



In waste places, Maine to Florida, Ohio, Ar- 

 kansas, Texas and Mexico. Bermuda. Pata- 

 gonia- or apple-mint. Horse-mint. Wild mint. 

 Naturalized from Europe. July-Sept. 



