146. Gramineae 353 



76. Erianthus Michx. 



1. Spikelets awned : open woods, s. 111. Plume Grass [E. divaricatus 

 (L.) Hitchc] E. alopecuroides (L.) Ell. 



1. Spikelets awnless; cultivated for ornament; native of Eur. Ra- 

 \enna Grass E. ravenyiae (L.) Beauv. 



77. Sorghum Pers. 



1. Perennial with creepint^ rhizomes; spikelets readily deciduous at 

 maturity; pedicellate spikelet usually staminate; fields and 

 waste places; escaped from cult.; introd. from Eur. June- 

 Oct. Johnson Grass S. halepense (L.) Pers. 



1 . Annual ; spikelets persistent at maturity ; pedicellate spikelet 

 usually neuter, shorter than the sessile one; waste places, 

 occasionally escaped from cult.; resembling Zea mays when 

 not in bloom. Sorghum. {S. saccharatum Moench]. More robust 

 plants with loose panicles are known as S. drummondii Nees 

 S. vulgar e Pers. 



78. Sorghastrum Nash — Indian Grass 



S. nutans (L.) Nash. Prairies, open woods, roadsides, common. 

 Aug.-Oct. 



Tribe 11. Tripsaceae — Corn Tribe 



79. Tripsacum L. — Gama Grass 



T. dactyloides L. Wet ground, local; chiefly in the s. half of the 

 state, but extending northward to Hancock, Fulton, and Tazewell 

 counties. May-Sept. 



80. Zea L. — Maize. Indian Corn 



Z. mays L. Cultivated; but rarely spontaneous along roads or in 

 waste places. July-Sept. 



