710 LABIATAE (MINT FAMILY) 



* * Leaves incised or pinnatifid at least at base. 



6. L. EUROPAtus L. Rarely stolon if erous, not tuberiferous ; stem coarse^ 

 more or less villous, 1 m. or less high ; leaves petioled, ovate, pubescent, coarsely 

 toothed, sinuate or pinnatifid at base; calyx-teeth subulate-tipped. — Damp or 

 waste ground, Mass to Va, (Nat. from Eu. ) 



7. L. americanus Muhl. Stem erect, slender, 2-9 dm. high, acutely 4-angled, 

 glabrate, freely stoloniferous ; leaves oblong or lanceolate, acuminate, irreg^i- 

 larly incised or laciniate-pinnatifid, the upper narrow and merely sinuate, all 

 tapering to slender petioles ; calyx-teeth short-cuspidate ; sterile filaments slen- 

 der, conspicuous, with globular or spatulate tips. (L. sinuatus Ell.) — Damp 

 soil, Nfd. to B. C, and southw. 



32. MENTHA [Toum.] L. Mint 



Calyx bell-shaped or tubular, the 5 teeth equal or nearly so. Corolla with a 

 short included tube, the upper lobe slightly broader, entire or notched. Stamens 

 4, equal, erect, distant. — Odorous perennial herbs ; the small flowers mostly in 

 close clusters, forming axillary capitate whorls, sometimes approximated in in- 

 terrupted spikes, produced in summer, of two sorts as to the fertility of the sta- 

 mens in most species. Corolla pale purple or whitish. Species mostly adventive 

 or naturalized from Europe, with many hybrids. (Mlvdrj of Theophrastus, from 

 a Nymph of that name, fabled to have been changed into Mint by Proserpine.) 



* Spikes narrow and leafless, densely crowded ; leaves sessile or nearly so. 



t- Spikes canescent. 



1. M. longif6lia (L.) Huds. (Horse M. of Eu.) Finely pubescent or ca- 

 nescent; leaves ovate-oblong to oblong-lanceolate, acute, sharply serrate, often 

 glabrous above ; spikes rather slender, canescently pubescent. (Jf. sylvestris L.) 

 — Roadsides, etc., Ct. to Del., Pa., and O. (Nat. from Eu.) 



2. M. ALOPEcuRoiDES Hull. Dowuy ; leaves larger, more near'y sessile, 

 broadly oval and obtuse, often subcordate, coarsely open-dentate, more veiny^ 

 but not rugose above ; spikes coarser, canescent ; approaching the next. — Damp 

 roadsides, etc., Ct. to N. J., Mo., and Wise. (Nat. from Eu.) 



H- t- Spikes not canescent. 



3. M. rotdndif6lia (L.) Huds. Soft-hairy or downy ; leaves broadly ellip- 

 tical to round-ovate and somewhat heart-shaped, rugose, coarsely crenate-toothed ; 

 spikes slender. — At a few stations. Me. to ()., Fla., and Tex. (Nat. from Eu.) 



4. M. spicAta L. (SpbarxMInt.) Nearly smooth ; leaves oblong- or ovate- 

 lanceolate, unequally serrate, sometimes short-petioled ; bracts linear-lanceolate 

 and subulate, conspicuous. {M. viridis L.) — Wet places, common (Nat, 

 from Eu.) 



* * Flowers pedicellate, less crowded in interrupted leafless spiciform clusters or 

 terminal heads, or some in the upper axils ; leaves petioled. 



-t- Calyx {at least the teeth) more or less hirsute. 



6. M. PIPERITA L. (Peppermint.) Glabrous, very pungent-tasted ; leaves 

 Ovate-oblong to oblong-lanceolate, acute, sharply serrate ; spikes becoming loose; 

 calyx glabrous below, the teeth hirsute. — Along brooks, frequent. (Nat. 

 from Eu.) 



6. M. aquAtica L. (Water M) Pubescent with recurved hairs; leaves 

 ovate or round-ovate ; flowers in a terminal globular or interrupted and ellipsoid 

 head, often with one or more clusters in the axils of the upper leaves ; calyx and 

 pedicels hairy. — Wet places, N. S. to Del., rare. (Nat. from Eu.) 



7. M. CRfsPA L. Glabrous or slightly pubescent ; Zeares short-petioled, ovate 

 to orbicular, lacerate-dentate and crisped; spikes narrow ; calyx slightly pubes- 

 cent or glabrate below. — Wet ditches, etc., C. to Pa. (Nat. from Eu.) 



