260 



GRASSES OF IOWA. 



more, at each node of the main rachis. Spikelets ovate, two to three 

 lines long, three to five-flowered; empty glumes nearly equal, three- 

 nerved ; flowering glumes strongly keeled, lanceolate, five-nerved, silky- 

 villous along the margins and keels and with a copious long web at the 

 base. Keels of the palea villous. This grass has been confounded with 

 P. abodes and P. autumnalis. It is closely related to the latter, but both 



FlG. 181. Poa Wolfii—a,, spikelet; b, flowering glume; 

 c, palet. (Charlotte M. King ) 



empty glumes are three-nerved, the flowering glumes are more acute and 

 have a tuft of long, webby hairs at the base. 



DISTRIBUTION. 



Iowa. Onl} found in northeastern Iowa, Allamakee County, banks 

 of \ ellow River. Rocks and rocky woods ( L. H. Pammel, E. Orr. 



