58 



PUBLIC HEAI/TH BULLETIN NO. 2 86 



55. Leaves with three prominent ribs — i 62. 



55. Leaves without three prominent ribs 56. 



56. Stems square or 4-angled 57. 



56. Stems round in cross-section - 60. 



57. Leaves petioled 58. 



57. Leaves sessile 59. 



58. Calyx of flower bearing a crest above (fig. 49) . Scutellaria, p. 135. 



58. Calyx bearing no crest (fig. 50) Mimulus, p. 136. 



Figure 49. 



U X 73 

 Figure 50. 



59. Flowers small, white, gathered in dense, sessile clusters 

 in the axils of the leaves (fig. 51). 



59. Flowers solitary in the axils of the leaves (fig. 50) 



60. Leaves small, mostly under 3 cm. long; 

 usually with black dots visible with a lens 

 covering them (fig. 52). 

 60. Leaves large, mostly over 5 cm. long and not 

 covered with black dots. 



Lycopus, p. 135. 



Mimulus, p. 136. 

 Gratiola, p. 135. 



61. 



Figure 51. 



