LABIATE. 279 



in interrupted spikes ; corolla purplish white, twice as long as the calyx ; 

 lower lip dotted with purple. In waste places, 3-4 feet high. July. 



2. N. GLECHOMA (Gill. Ground Ivy}. Stem creeping, rooting at 

 base ; leaves reniform, crenate, glaucous green ; flowers 3-5 together, in 

 loose clusters ; corolla light blue, variegated at the throat ; anther-cells di- 

 verging at a right angle. In waste grounds, 1-2 feet long. May-August. 



15. Physostegia. Calyx campanulate, with 5 nearly equal teeth, 

 inflated after flowering. Corolla with the throat inflated ; upper lip 

 nearly erect, entire ; lower lip spreading, 3-parted ; middle lobe broad 

 and rounded, emarginate. Stamens 4. 21 



P. VIRGINIANA (False Dragon's Head). Stem erect, thick, and rigid ; 

 leaves lanceolate-ovate ; flowers large, showy, in dense, terminal, 4-rowed 

 spikes ; corolla pale purple or flesh-color, spotted inside. Stem 1-3 feet high. 

 July-September. 



16. Lamium. Calyx tubular-campanulate, 5-ribbed, with 5 nearly 

 equal teeth. Corolla dilated at throat, bilabiate ; upper lip vaulted, 

 narrowed at base ; lower lip 3-parted ; lateral lobes small, attached to 

 the margin of the throat. Stamens 4. 



L. AMPLEXICAULE (Dead Nettle). Stems decumbent at base; leaves 

 broad, nearly round, hairy ; lower ones small ; cauline ones cordate ; floral 

 leaves similar, but nearly or quite sessile ; flowers in dense verticils, sessile 

 in the axils of the upper leaves ; calyx hairy ; corolla light purple, elongat- 

 ed ; upper lip downy ; lower lip spotted. In waste grounds, 5'-i8' high. 

 May-October. 



17. Leonurus. Calyx turbinate, 5-ribbed, with 5 subequal teeth. 

 Corolla bilabiate ; upper lip erect, oblong, entire, hairy ; lower lip 3- 

 lobed, spreading ; middle lobe obcordate. Stamens 4. y. 



L. CARDIACA (Motherworf). Stem erect, branching, often purplish; 

 leaves palmately lobed ; floral leaves trifid, variously toothed and arranged 

 in 4 rows on the stem ; flowers in dense, axillary whorls ; corolla purplish, 

 hairy outside, variegated inside. In waste places, 3-5 feet high. July-Sep- 

 tember. 



18. Galeopsis. Calyx tubular-campanulate, 5-ribbed, with 5 sub- 

 equal teeth. Corolla bilabiate, dilated at the throat ; upper lip ovate, 

 arched ; lower lip 3-cleft, spreading ; middle lobe obcordate, toothed ; 

 the palate with 2 teeth on the upper side. Stamens 4. 



G. TETRAHIT (Hemp Nettle). Stem hispid, swollen below the joints ; 

 leaves ovate, coarsely serrate, hispid, acute ; flowers in dense, axillary verti- 

 cils ; corolla purple, variegated with white. In waste places, 1-2 feet high. 

 June- July. 



19. Stachys. Calyx tubular-campanulate, angular, 5-io-ribbed, 

 5-toothed. Corolla bilabiate ; upper lip erect, spreading, or arched, 

 entire ; lower lip spreading, 3-lobed ; middle lobe nearly entire. Sta- 



