150 
LABIATAE. Vo, IIT. 
3. Mentha citrata Ehrh. Bergamot Mint. 
Fig. 3682. 
Mentha citrata Ehrh, Beitr. 7: 150. 1792. 
Perennial by leafy stolons, glabrous throughout; 
stem weak, branched, decumbent or ascending, 1°-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, 1’-13’ 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 var. longifolia L. Sp. Pl. 576. 1753. 
Mentha longifolia Huds. Fl. Angl. 221. 1762. 
Mentha sylvestris L. Sp. Pl. Ed. 2, 804. 1763. 
Perennial by suckers, canescent or puberulent 
nearly all over; stems mostly erect, branched, or 
simple, 1°-23° 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, 3’-14’ 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. 
fish-mint. 
Water or European horse-mint. 
Brook- or 
July-Oct. 
5. Mentha rotundifolia (L.) Huds. 
Round-leaved Mint. Fig. 3684. 
Mentha spicata var. rotundifolia L. Sp. Pl. 576. 
1753. ‘ 
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, 14°-23° 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, 1-2’ long, 9-15” 
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. 
