LABIATE. 161 



■*-■*- -I- ■*- Corolla evidently 2-lipped. Stamens with, anthers 4. 



7. Hysso'pus. Calyx tubular, IS-nerved, equally 5-toothed. 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'tlieiuniu. Calyx short-tubular, 10-13-nerTed, equally 5- 



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

 forming terminal corymbs. Aromatic plants, with narrow rigid 

 leaves crowded and clustered in the axils. 



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



toothed. Aromatic plants, with narrow leaves and purplish 

 spiked flowers. 



* * * Stamens only 2, parallel ; the anthers only l-celled. Corolla 

 2-lipped. 



10. nionar'da. 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 large, in whorled heads surrounded 

 by bracts. 



* * * * Stamens 4, the wjpper or inner prtir longer ! Anthers ajyproximate 



in pairs. Corolla 2-lipped. 



11. Nep'eta. Calyx obliquely 6-toothed. Anthers approaching each 



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

 anther divergent. 



12. Dracocepb'alnm. Calyx straight, Stoothed, the uppei' tooth 



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

 fringed leafy bracts, in a crowded head or spike. 



13. Lopban'tlias. 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 spikes. 



***** Stamens 4, the lower or outer pair longer ! Anthers approxi- 

 mate in pairs. Corolla 2-lipped. 



14. Calainin'tha. Calyx tubular, 2-lipped, often bulging below. Co- 



rolla 2-Upped, t?ie upper lip not arched, the throat inflated. Flowei-s 

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

 crowded with linear or awl-shaped hairy bracts. 



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



lower 2-cleft. Corolla nearly white, the tube recurved-ascending. 

 Stamens curved and conniving under the upper lip. Flower- 

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

 the leaves. 



