A GUIDE AND KEY TO AQUATIC PLANTS 



79 



10. Spikelets spineless (awnless)' but subtended 13. Setaria, p. 84. 



by several bristles; panicle often nodding 



(fig. 9). 

 10. Spikelets long-spiny (long-awned), with or 14. Erianthus, p. 84. 



without hairs at base; panicle not nodding 



(fig. 10). 



Figure 9. 



FiGUEE 10. 



11. Spikelets appressed along one side of rachis, forming 12. 

 1 to many compact 1 -sided spikes or spike-like 

 racemes. 



1 1. Spikelets not appressed along one side of rachis 14. 



12. Spikelets 6 mm. long or more; grass grow- 3. Spartina, p. 81. 

 ing in huge clumps (fig. 11). 



12. Spikelets 5 mm. long or less 13. 



13. Spikelets arranged along rachis with back of fruit 8. Axonopus, p. 82. 



away from rachis; rachis 3-sided (fig. 12). 

 13. Spikelets arranged along rachis with back of fruit 9. Paspalum, p. 82. 

 toward rachis; rachis often winged or foliaceous 

 (fig. 2). 



FlQUBB 11. 



Figure 12. 



