552 CONTEIBUTIONS FEOM THE NATIONAL HERBAEIUM. 



Stamens curved, often converging; 



calyx various; anther-bearing 



stamens 2 or 4; inflorescence 



various. 



Shrub; calyx regularly 5- 



toothed; anther-bearing 



stamens 2 10. Poliomintha (p. 556). 



Herbs, calyx 2-lipped; anther- 

 bearing stamens 2 or 4. 

 Flowers in terminal heads; 

 leaves large; anther- 

 bearing stamens 4... 11. Clinopodium (p. 556). 

 Flowers in axillary clusters 

 or in interrupted 

 spikelike inflores- 

 cences; leaves small; 

 anther-bearing sta- 

 mens 2 12. Hedeoma (p. 557). 



Upper lip of the corolla more or less con- 

 cave. 

 Anther-bearing stamens 2. 



Calyx equally 5-toothed; con- 

 nective short, the anther 

 sacs confluent; flowers in 

 crowded, bracteate, ver- 

 ticillate or terminal 

 heads, the bracts often 



colored 13. Monarda (p. 559). 



Calyx 2-lipped, the upper lip 

 obscurely 3-toothed or en- 

 tire, the lower 2-toothed; 

 connective long, with a 

 perfect anther sac at one 

 end and a rudimentary 

 one at the other; flowers 

 never in headlike clus- 

 ters 14. Salvia (p. 560). 



Anther-bearing stamens 4. 



Upper stamens longer than the 

 lower. 

 Calyx distinctly 2-lipped; 

 flowers very small, ob- 

 scured by the numerous 



bracts 15. Moldavica (p. 562 



Calyx about equally 5- 

 toothed; flowers usually 

 larger and the bracts of 

 the inflorescence not con- 

 spicuous. 

 Anther sacs parallel or 

 nearly so; stamens di- 

 vergent 16. Agastache (p. 562). 



Anther sacs divaricate; sta- 

 mens approximate in 

 pairs 17. Nepeta (p. 564). 



