LABIATiE. 161 



-t~ ■*-■*- -*- Corolla evidently 2~lipped. Stainens witli anth&rs 4. 



7. Uysso'piis. Calyx tubular, 15-nerved, equally S-tootbed. Corolla 



blue-purple, short ; upper lip erect, flat, obscurely notched, the 

 lower 3-cleft, with the middle lobe larger and 2-cleft. Stamens 

 exserted, diverging. Flowers in small clusters, crowded in a 

 spike. Branches simple, wand-like. 



8. Fycnan'theninni. Calyx short-tubular, 10-13-nerved, equally 5- 



toothed. The whitish or purplish flowers in small dense heads, 

 forming terminal corymbs. Aromatic plants, mth narrow rigid 

 leaves crowded and clustered in the axils. 



9. Satnre'la. Calyx bell-shaped, not hairy in the throat, equally 5- 



toothed. Aromatic plants, with narrow leaves and purplish 

 spiked flowers. 



* * * Stainens only 2, parallel ; the anthers only 1-celled. Corolla 

 2-lix)ped. 



10. monar'fla. Calyx tubular, nearly equally 5-toothed, hairy in the 



throat. Corolla elongated, strongly 2-lipped, the upper lip narrow. 

 Stamens with long protruding filaments, each bearing a linear 

 anther on its apex. Flowers lai-ge, in whorled heads surrounded 

 by bracts. 



* * * * Stamens^ 4, tlie it^per or inner piir longer ! Anthers approximate 

 in pairs. Corolla 2-lipped. 



11. Nep'eta. Dalyx obliquely 5-toothed. Anthers approaching each 



other in pairs under the inner lip of the corolla, the cells of each 

 anther divergent. 



12. DracocepU'aliiui. Calyx straight, 5-toothed, the upper tooth 



much the largest. Whorls of bluisii flowers with awn-toothed or 

 fringed leafy bracts, in a crowded head or spike-. 



13. Lophau'tlins. Calyx obliquely 5-toothed. Stamens exserted, the 



upper pair declined, the lower ascending, so that the pairs cross. 

 Anther-cells parallel. Tall herbs with small flowers in inter- 

 rupted terminal siJikes. 



» * ** K stamens 4, th^ lower or outer pair longer! Anthers approxi- 

 mate in pairs. Corolla 2-lipped. 



14. Calamln'tlia. Calyx tubular, 2-lipped, often bulging below. Co- 



rolla 2-lipped, the upper lip not arched, the thro.at inflated. Flowers 

 pale purple, in globular more or less dense clusters which are 

 crowded with linear or awl-shaped hairy bracts. 



15. Melis'sa. Calyx with the upper lip flattened and 3-toothed, the 



lower 2-cleft. Corolla neai'Iy white, the tube rocurved-ascending. 

 Stamens curved and conniving under the upper lip. Flower- 

 cluster loose, few-flowered, one-sided, with few bracts resembling 

 the leaves. 



