80 PUBLIC HEALTH BULLETIN NO. 286 



14. Spikelets with several florets (fig. 13) 2. GlyCeria, p. 81. 



14. Spikelets 1-flowered 15. 



15. Spikelets very strongly flattened (fig. 14) 4. Leersia, p. 81. 



15. Spikelets not strongly flattened 16. 



Figure 13. 



Figure 14, 



16. Spikelets inflated or gibbous at base (fig. 15) 11. Sacciolepis, p. 83. 



16. Spikelets not inflated at base (fig. 16) 10. Panicum, p. 82. 



XI 



x\0 



Figure 16. 



1. Arundinaria Michx. 



1. Panicles on leafy branches; stems often over 2 m. high. 1. A. gigantea. 

 1. Panicles on naked shoots from rhizomes; stems usually 2. A. tecta. 

 under 2 m. high. 



1. A. gigantea (Walt.) Chapm. Giant Cane — Occurs in colonies or 

 canebreaks, mostly along river lowlands. Flowers very infrequently 

 and for that reason is sometimes difficult to distinguish from the 

 following species. Both species occur over all of our area, but the 



