8o6 FLORA. 



gate to 5-10 cm. in fruit; bracts lanceolate, acuminate; calyx-teeth setaceous, 

 usually about one-half as long as the tube; corolla puberulent. In waste places, 

 Me. to N. Car., Tex. and Mex. July-Sept. 



6. Mentha alopecuroides Hull. WOOLLY MINT. (I. F. f. 3179.) Peren- 

 nial by suckers, white-woolly, 3-9 dm. high. Leaves broadly oval, sessile, or 

 partly clasping by a subcordate or rarely rounded base, obtuse, sharply and rather 

 coarsely serrate, the lower 5-8 cm. long; spikes dense, stout, obtuse, 5-8 cm. long 

 in fruit; bracts lanceolate; calyx-teeth setaceous, one-half as long as the campan- 

 ulate tube, or more; corolla pubescent. Along roadsides, N. Y., N. J. and Penn. 

 to Mo. Nat. from Europe. July-Oct. 



7. Mentha aquatica L. WATER MINT. FISH MINT. (I. F. f. 3180.) Per- 

 ennial by suckers, hirsute or pubescent, rarely glabrate ; stem 3-8 dm. high, its 

 hairs reflexed. Leaves broadly ovate, petioled, acute, or the lower obtuse, rounded, 

 subcordate or rarely narrowed at the base, sharply serrate, the larger 3-8 cm. long 

 and nearly as wide ; whorls of flowers in dense short rounded spikes, and usually 

 also in the upper axils ; spikes seldom more than 2.5 cm. long in fruit ; bracts 

 lanceolate, shorter than the flowers ; calyx hirsute, its teeth lanceolate-subulate or 

 triangular-lanceolate, one-third to one-half as long as the nearly cylindric tube ; 

 corolla sparingly pubescent. In wet places, N. S. to Penn. and Ga. Nat. from 

 Europe. Aug. -Oct. 



8. Mentha crispa L. CRISPED-LEAVED, CURLED OR CROSS MINT. (I. F. f. 

 3181.) Sparingly pilose-pubescent, at least at the nodes, petioles and veins of the 

 lower surfaces of the leaves ; stem rather weak, 3-9 dm. long. Leaves petioled, or 

 the uppermost sessile, ovate, mostly acute, rounded, truncate or subcordate at 

 the base, their margins crisped, or the uppermost merely serrate ; whorls of flow- 

 ers in thick rounded spikes, which become 2-4 cm. long in fruit ; calyx sparingly 

 pubescent or glabrous, its teeth subulate, more than one-half as long as the cam- 

 panulate tube ; corolla glabrous. In swamps and roadside ditches, N. Y., N. J. 

 and Penn. Aug. -Oct. 



9. Mentha arvensis L. CORN MINT. FIELD MINT. (I. F. f. 3182.) Per- 

 ennial by suckers, pubescent or glabrate ; stems 1.5-6 dm. high, slender. Leaves 

 oblong-lanceolate, oval or ovate, petioled, acute or the lower obtuse, crenate-serrate, 

 mostly narrowed at the base, 2-6 cm. long, 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, N. B. to N. Y., N. J., Penn. and Fla. AlsoinCal. and Mex. Nat. July- 

 Sept. 



10. Mentha gentilis L. CREEPING OR Do WNYWHORLED MINT. (I. F. f. 3183.) 

 Perennial by suckers ; stem puberulent with short reflexed hairs, 3-6 dm. high. 

 Leaves ovate or oval, short-petioled. sparingly pubescent with scattered hairs, often 

 blotched, acute at both ends, sharply serrate, the larger 3-5 cm. long, the upper 

 sometimes much smaller than the lower ; whorls axillary ; pedicels glabrous ; calyx 

 campanulate, glabrous below, its teeth subulate, ciliate, one-half as long as the 

 tube ; corolla glabrous. In waste places and along streams, Me. to northern N. 

 Y., N. J. and Penn. Nat. from Europe. Aug. -Oct. 



11. Mentha sativa L. MARSH WHORLED MINT. (I. F. f. 3184.) Perennial by 

 suckers ; stem ascending, usually widely branched, densely pubescent, 3-9 dm. 

 long. Leaves ovate, short-petioled, pubescent on both sides, acute at the apex, 

 mostly rounded at the base, sharply serrate, the larger 2-5 cm. long, the upper 

 sometimes much smaller ; whorls axillary, commonly surpassing the petioles ; calyx 

 campanulate, pubescent, its triangular-subulate teeth one-half as long as the tube. 

 In waste places, N. S. toJPenn. Nat. from Europe. July-Sept. 



12. Mentha Canadensis L. AMERICAN WILD MINT. (I. F. f. 3185.) Per- 

 ennial by suckers ; stem more or less pubescent with spreading or scarcely reflexed 

 hairs, or glabrate, 1.5-8 dm. high. Leaves oblong, ovate -oblong, or oblong-lance- 

 olate, slender-petioled, acute, or the lower obtuse, sharply serrate, narrowed to a 

 somewhat cuneate base, glabrous or sparingly pubescent, the larger 5-10 cm. long, 

 whorls axillary, often shorter than the petioles ; calyx oblong-campanulate. pubes- 

 cent, its teeth uue-iourth to one-third as long as the tube. In moist soil, N. B. to 

 the N. W. Terr., Br. Col., Va., Kans., N. Mex. and Nev. Variable. July-Oct. 



