LABIATVE. 101 



4. L,yc'oi>us. Calyx-teeth 4 or 5. Stamens 2, the upper pair, if any, without 

 anthers. Flowers white, in dense axillary clusters. 



* H- Corolla evidently 2-lipped, but the lobes nearly equal in size; the tube 



not bearded inside. Stamens with anthers 2. 



f>. Hedeo'ma. Catyx 2-lipped, bulging on the lower side at the base, hairy 

 in the throat ; 2 stamens with good anthers, and 2 sterile filaments 

 with false anthers. Low odorous plants, with bluish flowers in loose 

 axillary clusters. 



i~ t~ i- Corolla 2-lipped, the lower of the 5 lobes much larger than the 



other k', the tube with a bearded rin<j inside. Stamens 



3 (occasionally 4), much exserted. 



6. Collinso'iiia. Calyx ovate, enlarged and turned down in fruit, 2-lipped. 



Corolla elongated, the lower lip toothed or fringed. Strong-scented 

 plants with yelloioish flmoers on slender pedicels in terminal panicled 

 racemes. 

 -i- -- -i- -t- Corolla evidently 2-lipped. Stamens with anthers k. 



7. Pyciian'themum. Calyx short-tubular, 10-13-nerved, equally 5-toothed. 



The whitish or purplish flowers in small dense heads, forming terminal 

 corymbs. Aromatic plants, with narrow rigid leaves crowded and 

 and clustered in the axils. 



8. Sature'ia. 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 1-celled. Corolla 2-lipped. 



9. Moiiar'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 U, the Cupper or inner pair longer ! Anthers approximate in 



pairs. Corolla 2-lipped. 



10. Nep'eta. Calyx obliquely 5-toothed. Anthers approaching each other 



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

 divergent. (See Figs. 59 and 60, Part I.) 



11. Liophan'thus. Calyx obliquely 5-toothed. Stamens exserted, the upper 



pair declined, the lower ascending, so that the pairs cross. Anther-cells 

 nearly parallel. Tall herbs with small flowers in interrupted terminal 

 spikes. 



12. Calamin'tha. Calyx tubular, 2-lipped, often "bulging below. Corolla 



2-lipped, the upper lip not arched, the throat inflated. Flowers pale 

 purple, in globular more or less dense clusters which are crowded with 

 linear or awl-shaped hairy bracts 



***** Stamens ,4, the lower or outer pair longer ! Anthers approximate in 

 paii's. Corolla 2-lipped. 



13. Physoste'gia. Calyx not 2-lipped, 5-toothed or lobed, thin and mem- 



branaceous, inflated-bell-shaped in fruit. Anther-cells parallel. Flower* 



