no Labiatae. 



450 Anthers ciliate, Galeopsis XII. 



450 Anthers glabrous, 451 



451 Calyx campanulate, lateral lobes of lower corolla 



lip reflexed Stachys XIII. 



451 Calyx tubular, lower corolla lip 3-lobed, lobes 



spreading (j^owers )/e^icniJ — see Lamium), . . Ballota X. 



l.—LYCOPUS. 



LYC'OPUS EUROP-^'US {90). Gipsywort. 6—9. Calyx campanulate 

 (11 16) 5-toothed, corolla 4-cleft nearly regular, stamens 2, stem i — 3 ft. erect, 

 leaves ovalo-oblong deeply serrate or pinnatifid, flowers white minute 

 in dense whorls sessile in the axils of the upper leaves. Ditches. 



II.— MENTHA. 



Calyx 5-toothed, corolla nearly regular not much longer than the calyx 

 4-cleft. 



Flowers in whorls in a terminal spike 452 



Flowers in axillary whorls shorter than the leaves 

 not in a terminal spike, 453 



452 Upper leaves sessile, 454 



452 Leaves petiolate, 455 



453 Upper leaves smallest, calyx-teeth acute, . . . . M. sativa. 



453 Leaves all same size, calyx-teeth as broad as long, . M. arvensis. 



454 Leaves broadly ovate, . . . . . M. rotundifolia. 



454 Leaves lanceolate, 456 



455 Glabrous, spike lax, M. piperita. 



455 Hairy, spikes terminal axillary dense, . . . M. aquatica. 



456 Leaves glabrous, M. viridis. 



456 Leaves hairy, M. sylvestris. 



MEN'THA SYLVESTRIS (58). Horsemint. 8—9. Stem 2—3 ft. 

 {1104) robust erect downy, leaves sessile lanceolate or ovate serrate hoary 



beneath, flowers numerous small in dense cylindric terminal or axillary 



spikes. Moist tvaste places. 



MEN'THA SATI'VA (83). Marsh Whorled-mint. 7—8. Leaves 

 (1109- petiolate ovate-lanceolate acutely serrate upper leaves smaller, calyx- 

 II 13) teeth lanceolate acuminate, flowers lilac in dense distant whorls. 

 Wet waste places. 



MEN'THA ARVEN'SIS (100). Com Mint. 8—9. Leaves petiolate 

 (1114) ovato-lanceolate obtusely serrate all about the same size, calyx- teeth 

 triangular, flowers lilac in axillary whorls. Cornfields. 



