278 DICOTYLEDONOUS PLANTS. 



branched. Flowers variegated with red and white. Calyx hairy. 

 Smaller than the next. Introduced. Red Hemp Nettle. 



2. G. tetrahit Linn. : stem hispid, swollen between the joints ; leaves 

 ovate, hispid, serrate ; flowers numerous, in whorls ; corol twice as 

 long as the calyx. 



HAB. Waste places. N. S. W. to Mich. July. .Stem 

 1 2 feet high. Flowers rose coloured, with a wliite tube ; lower 

 lip dotted with purple. Calyx hispid, the teeth pungent. In- 

 troduced. Hemp Nettle- 



14. LEONURUS. Linn. 



Calyx 5-angled, 5-toothed. Upper lip of the corol very 

 hairy above, entire ; lower one reflexed, 3-parted. Anthers 

 sprinkled with shining dots. Didynamia. Gymnospermia. 



L. cardiaca Linn. : leaves petiolate, pubescent, paler beneath ; cau- 



line ones lanceolate, 3-lobed ; upper ones entire ; flowers in numerous 



whorls ; corol downy on the upper lip ; calyx stiff, becoming spiny. 



HAB. Waste grounds. Can. to Car. July, Aug. It- Stem 



2 3 feet high, branched, villous. Flowers in crowded whorls. 



white with a reddish tinge. Introduced. Mothcncort. 



15. LAMIUM. Linn. 



Calyx 5-toothed ; the teeth acuminate, spreading. Upper 

 lip of the corol vaulted, entire ; lower one 2-lobed, toothed 

 on each side at the base. Anthers hairy. 



Didynamia. Gymnospermia. 



L. amplexicaide Linn. : floral leaves broadly cordate, sessile, clasp- 

 ing, crenate or cut ; lower ones petiolate. 



HAB. Fields and road sides. N. S. May Nov. <2>. Stem 

 68 inches high. Flowers with the tube slender, rose coloured. 

 Introduced. ? Dead Nettle. 



16. DRACOCEPHALUM. Linn. 



Calyx subequal, 5-cleft. Orifice of the corol inflated ; up- 

 per lip concave. Stamens unconnected. 



Didynamia. Gymnospermia. 



1. D. virginianum Linn. : spikes long, with the flowers crowded ; 

 bracts small, subulate ; teeth of the calyx short, nearly equal ; leaves 

 sessile, opposite, linear-lanceolate, acutely serrate. 



HAB. Mountain meadows. N. Y. to Car. W. to Michigan. 

 June. Z. Stem 1 2 feet high, smooth except at the summit. 

 Flowers large, bright purple, generally opposite, in terminal 

 spikes. Dr. Hough ton has found this species as far west as 

 Red Cedar River. 



2. D. denticulatum Linn. : spikes long, with the flowers distant : 



