272 DICOTYLEDONOUS PLANTS. 



/. cotruleus Mich. 



HAB. River banks. N. Y. to Virg. W. to Miss. July, Aug. 

 . Plant viscidly pubescent, a foot high. Leaves oval-lanceo- 

 late, acute at both ends, 3-nerved. Flowers jale blue, 12 on 

 axillary peduncles. 



3. MEN'THA. Linn. 



Carol nearly regular, 5-lobed ; the broadest lobe notched. 

 Stamens erect, distant. Didynamia. Gymnospermia. 



* Flowers in a spike. 



1. M. piperita Linn.: spikes .obtuse, interrupted below ; leaves ovate, 

 subglabrous, petiolate ; calyx very smooth at the base. 



HAB. Marshy grounds near Salina, N. Y. ; apparently native. 

 July. It. Stem 1215 inches high, erect, often purplish. 

 Leaves varying in form from cordate-ovate to ovate-lanceolate. 

 Flowers purple. . Peppermint. 



2. M. viridis Walt. : spikes interrupted ; leaves subsessile, lanceolate- 

 ovate, smooth ; bracts setaceous, and with the teeth of the calyx some- 

 what hairy ; stamens not exserted. M. tennis Mich, 



HAB. Wet grounds. N. Y. to Geor. July t Aug. It. Stem 

 1218 inches high. Flowers pale purple, in a long spike con- 

 sisting of remote whorls. Spearmint. 



** Flowers whorled. 



3. M. canadense Linn. : flowers whorled ; leaves lanceolate,, serrate, 

 petioled, hairy ; stamens as long as the corol. 



HAB. Sandy soils. Can. and N. S. W. to Miss. 'Aug., Sept. 

 It. Stem a foot high. Flowers in axillary whorls, pale purple. 



4. M. borcatis Mich. : ascending, pubescent ; leaves petioled, ovate- 

 lanceolate, acute at both ends ; flowers in whorls ; stamens exsert. 



HAB. Moist grounds. Can. and N. S. July, Aug. It- Stem 



I 2 feet high. Flowers white or pale purple. Stamens twice 



as long as the corol. Perhaps not distinct from the preceding. 



Div. II. SATUREINE-E. 

 4. PYCNANTHEMUM, Mich. 



Heads of flowers surrounded by an involucre of jnany bracts. 

 Calyx tubular, striate, 5-toothed. Corol with the upper lip 

 nearly entire, the lower one trifid ; middle segment longer. 

 Stamens distant ; cells of the anthers parallel. 



Didynamia. Gymnospermia. 



* Stamens exserted. 



1. P. incanum Mich. : leaves oblong A>vate, shortly petiolate, acute, 

 subserrate/hoary-tomentose ; heads of flowers pedunculate, compound, 

 lateral and terminal ; bracts setaceous. Clinopodium incanum Linn. 



