AVEXK.E. 373 



e. Pjiiiiele slender, awn on tlio tloral gluino very 

 sliort and straight 4 



e. Panicle very slender, awn of lowest lloral glume 

 longer and bent wiien dry 



e. Panicle dense 7 



d. First glinne 1-nerved (i) 



f. Panicle usually spikelike 7, 8. 9 



f. I'anicle not spikelike (g) 



g. Spikelets 'Mlowered 11, l::i 



g. Spikelets ;i-4-tlowored. ... 13, 13, U, 15 



1. T. palustre (Michx.) Torr. Fl. U. S. 1: 126 (1834). Arena 

 Pennsiflfani'iv Jj. Hih PI. TO (1753)? Jivna Carolinian a Walt. 

 Fl. Car. 81 (1788)? Arena jialtisfri.^ Michx. Fl. Bor. Am. 1:73 

 (1803). T. Pennxylraniruni li. S. P. Prel. Cat. N. Y. 67 (1888). 



A smooth and slender erect perennial, 50-90 cm. high. 

 Ijcaf-blades flat, 8 cm. long, 5 mm. 

 wide. Panicle narrow, loose, 10-30 

 cm. long, rays capillary. Spikelets 2- 

 flowered, compressed, lower floret awn- 

 less, the upper awned and raised on a ijjjhii ., 

 slightly hairy rachilla nearly 2 mm. *'■""'"' '■'■^ 

 long and continued beyond as much 

 fanlier; first empty glume lanceolate, ^u WB/ijit 

 1-nerved, 4-5 mm. long, second about *«* mm 

 one-fifth longer, elliptical-lanceolate, 

 3-nerved; floral glume of the lower 

 floret 5 mm. long, awnless, nearly 

 smooth at the base, 3-nerved. closely 

 resembling the second emptv glume; 



lloral glume of the upper flor;t shorter ^X^^eU^'c^CJrT' 

 and narrower than the lower one, 



bearing a slender spreading or bent awn next the short bifid tip; 

 paleae about two-thirds as long as their glumes, bifid, nerves diverg- 

 ing. Anthers over 1 mm. long. 



For an account of a supposed hybrid between this species and 

 Eatonia Pennsylranica, see Bull. Torr. Club, 13:118 (1886). 



