82 PUBLIC HEALTH BULLETIN NO. 2 86 



6. Zizaniopsis Doell and Aschers 



7j. miliacea (Michx.) Doell and Aschers. Cutgrass — Often giows 

 in the same situations as Zizania but usually more abundant. Marshes 

 along the larger rivers seem to be favored by it, and in Reelfoot Lake, 

 Tennessee, Anophelei^ qtiadrimactilahis has been found associated with 

 it. Its range includes all of our Coastal Plain. 



7. Hydrochloa Beauv. 



/-]. caroliniensis Beauv. — Widespread in the Coastal Plain, Florida 

 to North Carolina and Louisiana; occurs in acid to neutral water, 

 showing considerable tolerance; has often been found harboring 

 Anopheles quadrimaculatus . 



8. Axonopus Beauv. 



1. Spikelets 4 to 5 mm. long, glabrous I. A. furcatus. 



1. Spikelets about 2 mm. long, sparsely appressed, silky — 2. A. affinis. 



\. A. Jurcatus (Fliigge) Hitchc. — Coastal Plain species, noted 

 along acid lake margins in the Okefmokee Swamp, occurs in all of our 

 States except Tennessee. 



2. A. affinis Chase. Carpet-grass — Coastal Plain species, most 



often found in acid situations, well distributed over our area but 



seldom grows in over an inch or two of water. Often behaves like a 



weed. 



9. Paspalum L. 



1. Rachis of inflorescence foliaceous, broad 2. 



1. Rachis not foliaceous or winged 3. 



2. Rachis extending beyond uppermost spikelets; 1. P.repens. 



racemes many, at least ovej" 6. 

 r, Racliis not extending beyond uppermost spike- 2. P. dissectmn. 

 let ; racemes 2 to 4. 



3. Racemes usually 2 (sometimes with a third) 3. P. distichum 



3. Racemes usually 4 to 6 4. P. praecox. 



1. P. repens Berg. — Floating or reclining plant, has been recorded 

 from all the States in our territor}' except possibly North Carolina, not 

 frequent. 



2. P.. dissectum L. — Well distributed in our area, infrequent, col- 

 lected once from limesink in Georgia, habit similar to preceding. 



3. P. distichum L. — Has been recorded from all of the States in our 

 territory, most common near the coast. 



4. P. praecox Walt. — Coastal Plain, sometimes in aquatic situa- 

 tions. In addition to the four species given above, there are several 

 other species of Paspalum which sometimes occur in wet places, but 

 since this is only an occasional habit for these species they are not 



included here. 



10. Panicum L. 



1. Spikelets short-pedicelled along one side of the rachis 2. 



forming spike-like racemes. 

 I. Inflorescences open or sometimes contracted and with 3. 



one-sided racemes but not as above. 



