96 



POACEAE 



65. Briza. 



68. Poa. 



69. Panicularia. 



70. puccinellia. 



71. Festuca. 



72. Bromus. 



Spikelets not as above; 

 flowering scales awn- 

 less. 

 Spikelets cordate at 



base, large. 

 Spikelets not cordate, 

 usually small. 

 Scales rounded on the back, at least below. 

 Flowering scales obtuse or subacute 

 at the apex. 

 Flowering scales prominently 



5-7 nerved; styles present. 

 Flowering scales obscurely 5 

 nerved; styles wanting. 

 Flowering scales acute, pointed or 

 apex awned. 

 Stigmas arising below apex of ovary; scales 

 rarely awnless. 



Tribe XI. Hordeae 

 Spikelets solitary at the notches of the rachis. 



Flowering scales with their backs turned to the rachis. 

 Flowering scales with their sides turned to the rachis. 

 Spikelets 2-6 at each joint of the rachis. 



Spikelets 1 flowered, or with a rudiment of a second 



flower. 

 Spikelets 2-many-flowered. 



Empty scales conspicuous. 

 Empty scales very small or none. 



i. Tripsacum L. 

 I. T. dactyloides L. In swamps or along streams: R. I. to Neb., 

 south to Fla., Tex. and Mex., the southern Bahamas, Haiti 

 and S. Am. 



Borders of the coastal marshes, unknown elsewhere. 



2. Coelorachis Brongn. 



1. C. rugosa (Nutt.) Nash. In wet soil along the coast: southern 

 N. J. to Md., Fla. and Tex. 



Known only from Bennett, Cape May Co.,N. J., in boggy meadow. 



3. Miscanthus Anderss. 



I. M. sinensis Anderss. Native of China, Japan and the 

 Celebes. Sometimes escaping from cultivation in E. U. S. 

 Very rare as an escape on L. I., not recently collected. 



