160 



LABIATAE 



Fertile stamens two. 



Calyx gibbous below. 15. HEDEOMA. 



Calyx not gibbous below. 



Calyx equally 5-toothed. 13. MONARDA. 



Calyx 2- lipped. 



Flowers blue. 12. SALVIA. 



Flowers whitish. 14. BLEPHILIA. 



Fertile stamens four. 

 Calyx 2-lipped. 



Calyx with a protuberance above. 3. SCUTELLARIA. 



Calyx with no protuberance above. 



Flowers in axillary clusters. 16. MELISSA. 



Flowers in terminal spikes. 



Upper lip of corolla strongly arched. 7. PRUNELLA. 



Upper lip of corolla not arched. 20. PERILLA. 



Calyx not 2-lipped. 



Flowers in terminal spikes. 



Upper pair of stamens the longer. 



Corolla greenish-yellow or bluish. 5. AGASTACHE. 



Corolla white, purple-dotted. 6. NEPETA. 



Lower pair of stamens the longer. 



Corolla seemingly 1-Iipped. 1. TEUCRIUM. 



Corolla 2-lipped. 



Flowers not whorled. 8. PHYSOSTEGIA. 



Flowers whorled. 11. STACHYS. 



Flowers in axillary clusters. 



Calyx teeth often ten. 4. MARRUBIUM. 



Calyx teeth five. 



Calyx teeth spiny -pointed. 9. LEONURUS. 



Calyx teeth not spiny -pointed. 



Upper pairs of stamens the longer. 6. NEPETA. 



Lower pair of stamens the longer. 10. LAMIUM. 



Flowers in terminal capitate clusters. 17. KOELLIA. 



1. TEUCRIUM L. WOOD SAGE. 



Four upper lobes of corolla small, the lower prominent. Flowers pur- 

 plish rose-colored. 



Calyx canescent. 1. T. Canadense. 



Calyx villous. 2. T. occidental. 



1. T. Canadense L. Perennial, l-3 high, downy : leaves ovate-lan- 

 ceolate, serrate, petioled : flowers 6 // long. Abundant throughout in 

 woodlands. June-September. 



2. T. oceldentale A. Gray. Resembles the last but flowers brighter 

 colored, and plant villous throughout. Locally common on prairies, 

 Dodson, Lake City, Atherton and Sibley. June-September. 



2. ISANTHUS Michx. 



Flowers axillary. Corolla bell-shaped, its tube not exceeding the calyx. 



1. I. brachiatus (L. ) B.S.P. FALSE PENNYROYAL. Annual, 6 X -15' 

 high, viscid-pubescent : leaves lance-oblong : corolla 2 // -3 // long. Not 

 uncommon in barrens throughout the southern part. July- September. 



