240 ORDER 91. LABIATE. 



9. PERILLA, L. Calyx subequally 5-toothed, in fruit becoming gib- 

 bous and 2-lipped. Cor. bell-form, 5-cleft, lower lobe a little longer. Sta 

 4, erect, distant, included. Asia. 



P. ociMohjES, /3. NANKIN^NSIS, is the PURPLE PERILLA, a fine leaf-plant, 2f high, with 

 large bronze-purple, ovate, cut-fringed leaves. (j3. crispa Benth.) 



10. MENTHA, L. MINT. Cal. equally 5-toothed. Cor. nearly regu- 

 lar, tube scarcely exscrtecl, border 4-cleft, the broadest segment emarginate. 

 Stam. 4, straight, distant, anth. cells parallel, fil. naked, if Strong-scented 

 herbs. Flowers in dense verticils, pale purple. Summer. 



* Leaves sessile. Verticils in a slender, terminal spike Nos. 1 -3 



* Leaves petiolate.ce Verticils in dense oblong spikes Nos. 4, 5 



x Verticils axillary, not in spikes Nos. 6- -8 



1 M. viridls L. Spearmint. Smoothish ; Ivs. lance-oblong, acute, cut-serrate ; spikes 



interrupted, attenuate above. Damp soils. 1 2f. Europe. 



2 M. rotundifolla L. Whitish-downy; Ivs. roundish to broad-ovate, sharp-serrate ; 



spikes cylindric, nearly continuous. N. J.. Pa. (at Easton, Prof. Porter). Ascending 

 2 3f. Spikes 23'. | Europe. 



3 Iff. sylvestris L. Woolly-tomentons ; Ivs. lance-ovate, canescent, finely serrate ; 



spikes conic-cylindric. Delaware Co., Pa. (A. H. Smith). 



4 HI. piper ita L. Peppermint. Smooth ; Ivs. ovate to lanceolate, serrate ; spikes 



1', oblong to cylindric ; calyx smooth. Wet. 2f. Europe. 



5 M. aquatica L. Stem reflex-hairy; leaves ovate, serrate, hairy or smoothish ; 



spike globular or oblong, calyx villous. Muddy. 



6 HI* sativa L. Stem reflex-hairy, erect, branched ; leaves ovate, canescent beneath ; 



calyx teeth subulate-awned. Lancaster, Pa. (Porter). Europe. 



7 OT. arvensis L. Smoothish, ascending; leaves ovate, serrate above, entire and 



acute at base ; calyx teeth acute. Fields, M. and W. : rare. 



8 OT. Canadeiisis L. Horsemint. Upright, hoary-pubescent with spreading hairs ; 



leaves lanceolate, very acute both ways ; cymes shorter than the petioles ; stamens 

 exserted. Damp. Can. to Pa. and Ky. 

 ft. boreali*. Plant nearly smooth, with narrower leaves. 



11. LYCOFUS, L. WATER HOARHOUND. Cal. tubular, 4-5-cleft. Cor. 

 subregular, 4-cleft, the tube as long as the calyx, upper segment broadest, 

 emarginate. Stam. 2, distant, diverging, simple, if Bog herbs, with the 

 very small flowers in axillary, dense clusters. 



1 \A. "VIrgiiiieus L. Bugle Weed. Lvs. broad lanceolate, serrate, tapering and entire 



at both ends ; calyx teeth 4, obtuse, spineless, shorter than the achenia. Common. 

 1 Ijf. Plant often purple, and often with long slender runners. July, August. 



2 1^. Europsens L. Lvs. lance-ovate to lance-oblong, petiolate, acute, sinuate-toothed 



or lobcd, the lower incised: calyx teeth 5, acuminate-spinescent, longer than the 

 smooth achenia. Common, and very variable. 1 2f. August. 

 p. riihelln*, with creeping stolons, and downy toothed Ivs. (L. rubcllus Mrnch.) 

 y. *fnuafu, with smooth sinuate-dentate leaves no runners. (L. sinuatus Ell.) 

 6. f^filtritiiff. Tall, with smooth leaves cut into linear teeth. (L. exaltatus Ell.) 

 . ang-ufitifoHiis. Leaves narrow, slightly toothed or subentire. (L. angust. N.) 

 . gestHfoJtv. Lvs. oblong, sessile or clasping, remotely toothed. N. J. (Porter). 



12. CUNILA, L. DITTANY. Cal. 10-ribbed, equally 5-toothed, throat 

 densely villous ; upper lip of corolla flat, emarginate. Stam. 2, erect, ex 

 eertcd, distant. Flowers numerous, pale red. 



