576 CONTEIBUTIONS FKOM THE NATIONAL HEKBAEIUM. 



Corolla bilabiate; steins leafy. 



Anther-bearing stamens 2 10. Gratiola (p. 586). 



Anther-bearing stamens 4. 

 Sepals united into an 

 angled tube; 

 leaves merely 



toothed, or entire. 11. Mimulus (p. 586). 

 Sepals distinct or nearly 

 so; leaves pinnat- 



ifid 12. CoNOBEA (p. 588). 



Lower lip or lobes of the corolla ex- 

 ternal in the bud. 

 Stamens 2. 



Corolla almost regularly 4- 

 lobed; leaves mostly 

 cauline; inflorescence 



not scapelike 14. Veronica (p. 588). 



Corolla none, or 2-lipped; 

 leaves basal; inflores- 

 cence scapelike 15. Besseya (p. 590). 



Stamens 4. 

 Corolla slightly 2-lipped, yel- 

 low; stamens not ascending 



under the upper lip 16. Dasystoma (p. 590). 



Corolla distinctly 2-lipped, of 

 various colors; stamens as- 

 cending under the upper 

 lip. 

 Anther sacs dissimilar, the 

 inner one pendulous by 

 its apex; leaves mostly 

 alternate. 

 Calyx 2-phyllous, or by ab- 

 sence of the lower part 



1-phyllous 17. Adenostegia (p. 590). 



Calyx gamosepalous, united 

 into a tube below. 

 Calyx deeply cleft before 

 and behind, less 

 deeply so (or not at 

 all) on the sides; up- 

 per lip of the corolla 

 much longer than the 

 3-lobed lower one; 



mostly perennials. . .18. Castilleja (p. 591). 

 Calyx almost equally 4- 

 cleft; upper lip of 

 corolla slightly if at 

 all longer than the 1 

 to S-saccate lower 



one; annuals 19. Orthocarpus (p. 594). 



Anther saca aUke, parallel; 

 leaves mostly opposite. 



