240 ORDER 91. LABIATE. 



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

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

 4, erect, distant, included. Asia. 



P. OCIMOIDES, )3. NANKINENSIS, is the PURPLE PERILLA, a fine leaf-plant, 2f high, with 

 large bronze-purple, ovate, cut-fringed leaves. (/3. crispa Benth.) 



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

 lar, tube scarcely exserted, border 4-cleft, the broadest segment einarg-inate. 

 Stam. 4, straight, distant, anth. cells parallel, fil. naked. 1$. Strong-scented 

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



* Leaves sessile. Verticils in a slender, terminal spike Nos. 13 



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



x Verticils axillary, not in spikes Nos. 68 



1 in. virldis L. Spearmint. Smoothish ; Ivs. lance-oblong, acute, cut-serrate ; spikes 



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



2 HI. rotnndifolia 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 HI. sylvestris L. Woolly-tomentous ; Ivs. lance-ovate, canescent, finely serrate ; 



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



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



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



5 HI. aqnatica L. Stem reflex-hairy ; leaves ovate, serrate, hairy or emoothish ; 



ppike 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 HI. arvensis L. Smoothish, ascending; leaves ovate, serrate above, entire and 



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



8 HI. Canadensis 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. 

 /3. borealin. Plant nearly smooth, with narrower leaves. 



11. LYCOPUS, 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. l[ Bog herbs, with the 

 very small flowers in axillary, dense clusters. 



1 Li. Virgiiiiciis L. Bugle Weed. Lvs. broad lanceolate, serrate, tapering and entire 



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

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



2 I.. Eiiropjeus L. Lvs. lance-ovate to lance-oblong, petiolate, acute, sinuate-toothed 



or lobed, the lower incised; calyx teeth 5, acuminate-spinescent, longer than the 

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

 ft. rubellu*) with creeping stolons, and downy toothed Ivs. (L. rubellus Moench.) 

 y. sinuatug) with smooth sinuate-dentate leaves no runners. (L. sinuatus Ell.) 

 S. ejcaltutuK. Tall, with smooth leaves cut into linear teeth. (L. exaltatus Ell.) 

 . angu*tifoliv*. Leaves narrow, slightly toothed or subentire. (L. angust. N.) 

 . ***tUfoliu8. 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, emargiuate. Stam. 2, erect, -ex 

 serted, distant. Flowers numerous, pale red. 



