LABIATAE 



Agastache 



Glechoma 



8 . Phlomis 



BB. Calyx lobes open, campanulate in fr. 



C. Stamens and style very short, included in the corolla tube .. 5. Marrubhtm 

 CC. Stamens or style, or both, more or less exserted from the 

 corolla tube. 

 D. Corolla strongly 2-lipped. 



E. Anther-bearing stamens 4; anthers 2-celled, ovate. 

 F. Stamens of upper pr. longer than the lower. 



Fls. in dense terminal spike-like panicles: erect 



plant, to 1 m. high: anther cells parallel .. 6. 



Fls. in loose axillary whorls: weak-stemmed de- 

 cumbent or creeping plant: anther cells 



divergent 7 . 



FF. Stamens of upper pr. shorter than the lower. 



G. Upper lip of corolla arched or hooded, villous. 

 H. Style lobes unequal, the upper lobe shorter. 

 HH. Style lobes equal or nearly so. 



Nutlets 3-angled, truncate at the apex. 

 Upper lip of the corolla pubescent, 

 but not white-woolly-hairy; calyx 

 teeth subulate but not spiny: lvs. 



crenate or serrate 9 . 



Upper lip of the corolla densely whit- 

 ish-woolly-hairy; calyx teeth 

 lpiny: vs. lobed or incised .... 10. 

 Nutlets ovoid, with rounded apex: 



calyx teeth sharply "pointed 11. 



GG. Upper lip of corolla short, broad, 3-4-fid, re- 

 curved; calyx teeth acute or obtuse, not 



sharply pointed 12 . 



EE. Anther-bearing stamens 2; anthers 1-celled linear .. 13. 

 DD. Corolla slightly 2-lipped, or lobes almost equal. 



I. Anther-bearing stamens 2. 



Robust stoloniferous perennials with simple erect 

 stems: fls. in dense axillary whorls: lvs. sharply 

 serrate or incised, not aromatic 14 . 



Brg. annuals with slender stems: fls. in 1-sided 

 racemes or spikes: lvs. aromatic, often 

 serrate 15 . 



II. Fertile stamens 4. 

 J. Fls. in axillary whorls or capitate. 



Corolla rather distinctly 2-lipped: plants not 



aromatic 16 . 



Corolla nearly regular: plants strongly aromatic 17. 

 JJ. Fls. clustered, or in racemes or spikes, not in 

 axillary whorls or capitate. 

 K. Fls. in terminal leafy or leafy-bracted clusters, 

 not in racemes or spikes. 

 Stems erect: flg. bracts large, ovate, over- 

 lapping; calyx equally 5-toothed 18. Origanum 



Stems decumbent or prostrate: flg. bracts 



small, subulate; calyx 2-lipped 19. Thymus 



KK. Fls. in terminal or axillary spikes or racemes. 

 L. Fls. in dense spikes. 



331 



Lamium 



Leonurus 

 Stachys 



Plectranthvs 

 Salvia 



Lycopus 



Mosla 



Sat u re j a 

 Mentha 



