280 DICOTYLEDONOUS PLANTS. 



G. hederacea Linn. : leaves reniform, crenate, hairy, veined. 

 HAB. Road sides. N. S. W. to Ohio. May, June. 1C. 

 a foot high, decumbent. Flowers large, blue, in threes, axillary. 



Ground ky. 



20. MARRUBIUM. Linn. 



Calyx with 10 ribs and 5 or 10 spreading teeth. Upper 

 lip of the corol bifid, linear, straight ; lower one trifid ; middle 

 segment the largest, emarginate. 



Didynamia. Gymnospermia. 



M. vulgare Linn. : stem erect, woolly ; leaves roundish-ovate, tooth- 

 ed, rugose, very woolly beneath ; whorls villous, many-flowered ; calyx 

 with 10 setaceous uncinate teeth. 



HAB. Road sides. Can. to Car. W. to Miss, July, Aug. If. 

 Mem 1218 inches high. Flowers small, white, in crowded 

 whorls. Smell aromatic ; flavour bitter. Medicinal. 



White Horeliound. 



21. BALLOTA. Linn. 



Calyx with 10 ribs and 5 teeth. Upper lip of the corol 

 concave, notched ; lower one trifid ; middle lobe the largest, 

 emarginate, Didynamia. Gymnospermia,. 



B. nigra Linn. : leaves ovate, undivided, serrate ; calyx dilated 

 above, subtruncate, with spreading teeth. 



HAB. Mass. Big. July. U.Stem 23 feet high. Leaves a 

 little cordate. Flowers purple or white, in axillary whorls. 



Black Horcliound. 



22. MELISSA. Linn. 



Calyx arid, above nearly flat ; upper lip subfastigiate. Up- 

 per lip of the corol partly vaulted, bifid ; middle lobe of the 

 lower lip cordate. Didynamia. Gymnospermia. 



M. offidnalis Linn. : whorls dimidiate ; bracts oblong, pedicellate ; 

 leaves ovate-acute, serrate. 



HAB. Road sides, &c. N. S. July. If. Naturalized. Balm. 



23. HEDEOMA. Pers. 



Calyx bilabiate, gibbous at the base ; upper lip 3-toothed, 

 lower 2 ; dentures all subulate. Corol ringent. Stamens 2- 

 sterile ; the 2 fertile ones about the length of the corol. 



Diandria. Monogynia. 



H. pulegioidts Pers. : leaves oblong, serrate ; peduncles axillary, 

 many-flowered. Cunila pulegioides Linn. Ziziphora pulegioides /?. & 

 S. 





