LABIATE. 271 



panulate, nearly equal, 4-lobed ; upper segments broader and 

 notched. Stamens 2, distant, simple. Achenia 4, smooth. 



1. L. sinuatus Ell. : stem erect, acutely 4-angled, smoothish; leaves pe- 

 tiolate. oblong-lanceolate, sinuate-toothed, the lower pinnatilid in the mid- 

 dle ; whorls many-flowered; calyx with 5 acute spinous teeth. L. Europ&us 

 Pursh not of Linn. L. Americanus MiM. 



Moist places. Arct. Amer. to Car. W. to Oregon. July, Aug. 1\.. Stem 

 erect, 1 2 feet high, square. Leaves opposite, upper ones slightly, lower ones 

 deeply, toothed. Flovxrs in dense, whorls, white. Calyx with spines, longer 

 than the achenia. Common Water Horehound. 



2. L. Virginicus Linn.: stem stoloniferous at base, smoothish; leaves 

 oblong or ovate-lanceolate, remotely toothed, tapering at each end; calyx 

 with 4 ovate spineless teeth. L. unijlorus Mich. 



Wet places. Can. to Car. W. to Rocky Mountains. July, Aug. %. Stem 

 12 18 inches high, simple or sparingly branched. Leaves opposite, sessile, pur- 

 plish. Flowers minute, white, in compact whorls. Formerly in great repute as 

 a remedy for haemoptysis. Bugle Weed. 



2. ISANTHUS. Mich. Isanthus. 



(From the Greek was , equal, and avOos, a flower ; the corolla being nearly 

 regular.) 



Calyx campanulate, 10-nerved, deeply 5 -toothed ; the throat 

 naked inside. Corolla scarcely longer than the calyx; tube 

 straight and short ; limb campanulate ; of 5 equal rounded 

 lobes. Stamens 4, nearly equal, erect, about as long as the 

 corolla. Style 2 -cleft at the summit. Achenia obovate. 



/. cceruleus Mich. 



River banks. N. Y. to Car. W. to Miss. July, Aug. CD- Plant viscidly 

 pubescent, about a foot high. Leaves elliptic-lanceolate, acute at both ends, 

 3-nerved. Flowers pale blue, 1 3 on axillary peduncles. 



False Pennyroyal. 



3. MENTHA. Linn. Mint. 

 (From jjftvOa or mvQri, an ancient Greek term.) 



Calyx tubular or campanulate, 5 -toothed, equal or somewhat 

 2-lipped. Corolla nearly regular, 4-lobed, the upper lobe 

 broader and emaroinate. Stamens 4, equal, distant. Achenia 

 smooth. 



* Flovxrs in spikes. 



1. M. pipcrifa Linn.: stem smooth; leaves ovate-lanceolate, petiolate, 

 acute, serrate, smoothish ; spikes interrupted ; pedicels and base of the 

 calyx smooth ; calyx-teeth hispid. 



Marshy grounds on the Hudson and in Western part of N.Y. July. r i\- Stem 

 ascending, 12 15 inches long, branched, often purplish. Leaves rounded at 

 base. Flowers pale purple, in spikes which consist of a few whorls. Introduced 

 from Europe. Peppermint. 



