38 PUBLIC HEALTH BULLETIN NO. 286 



KEY TO GROUP E 



1. Plants without leaves, consisting only of naked stems, 2. 

 sometimes with bladeless leaf sheathes, often bearing 

 a flower cluster at or near top. 



1 . Plants bearing leaves 12. 



2. Plants surmounted by a flower or fruit clus- 3. 

 ter. 



2. Plants without flowers 7. 



3. Flower cluster terminal 4. 



3. Flower cluster appearing lateral with stem extending 6. 

 *beyond. 



4. Leaf -sheaths present; flower cluster consisting 5. 

 of groups of flowers concealed by overlap- 

 ping scales. 

 4. No leaf-sheaths present; flower cluster con- Utricularia, p. 137. 

 sisting of 1 to several showy, irregular, yel- 

 low, or purple blossoms (fig. 1) . 

 5. Leaf-sheaths present only at base of stem; flowers in Eleocharis, p. 88. 



in one group (fig. 2). 

 5. Leaf-sheaths scattered along stem; flowers in several Fuirena, p. 93. 

 groups (fig. 3). 



XI 



xl 



Figure 1. 



Figure 2. 



Figure 3. 



