LABIATE. 271 



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

 notched. Stamens ^, distant, simple, Aclienia 4, smooth. 



1. Li. sinuatns Ell. : stem erect, acutely 4-angled, gmoothish; leaves pe- 

 tiolate, oblong-lanceolate, sinuate-toothed, the lower pinnatifid in the mid- 

 dle ; whorls many-flowered ; calyx with 5 acute spinous teeth. L. Europcsus 

 Pursh not of Linn. L. Americanus Muhl. 



Moist places. Arct. Amer. to Car. W. to Oregon. July, Aug. %.. — Stem 

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

 deeply, toothed. Flotoers 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. unijiorus Mich. 



Wet places. Can. to Car. W. to Rocky Moimtains. 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. ikficA.— Isanthus. 



(From the Greek laoi, equal, Sind avdos, a.Jlower; 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. Aehenia obovate. 



/. cceruleus Mich. 



River banks. N. Y. to Car. W. to Miss. July, Aug. (^i-— 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 liivOa or ^ivOri, 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 emarginate. Stamens 4, 'equal, distant. Aehenia 

 smooth. 



* Flowers in spikes. 



1. M. piperita 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. %.—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. 



