46 PUBLIC HEAl/TH BULLETIN NO. 286 



32. Leaves keeled (fig, 10).- Acorus, p. 104. 



32. Leaves not keeled 33. 



33. Root red (fig. 26) Gyrotheca, p. 111. 



33. Root not red 34. 



34. Leaves equitant at base; flowers few and Iris, p. 110. 

 showy purple or sometimes white (fig. 13). 



34. Leaves not equitant at base of plant 35. 



35. Flowers white in dense button-like heads; leaves Eryngium, p. 130. 



bristly-margined (fig. 27). 



35. Flowers yellow, not in button-like heads nor with Polygala, p. 120. 

 bristly-margined leaves (fig. 28) . 



Figure 26. 



Figure 27. 



Figure 28. 



