320 OHIO BIOLOGICAL SURVEY 



2. Echinochloa walteri (Pursh.) Nash. Marsh Cockspur-grass. 

 A grass with robust more or less succulent stems, 3-6 ft. long, and 

 a long more or less drooping panicle with compact ascending or 

 spreading branches. Spikelets long-awned, ovate-lanceolate, on one 

 side of the rachis, brownish-purple; inner empty glume and empty 

 lemma awned ; fertile lemma, ovate-lanceolate, acuminate. 



In marshes and ditches. Aug.-Oct. Erie, Lorain, Shelby, Au- 

 glaize, Licking. 



57. Paspalum L. Paspalum. 



Perennial grasses of various habit with the spikelets in spike- 

 like, one-sided racemes, digitate or racemose at the tip of the main 

 stem or branches. Spikelets with 1 perfect flower and a vestige, 

 plano-convex, nearly sessile, placed with the back of the fertile 

 lemma toward the rachis ; empty glumes very unequal or the outer 

 entirely obsolete ; lemma and palet indurated, margins of the lemma 

 inrolled ; grain free, enclosed in the flowering glumes. 



1. Rachis of the racemes very broad, membranous with inrolled margins, about 

 twice the width of the spikelets ; rachis not extending beyond the spikelets. 



P. disscctum. 



1. Rachis narrower than the spikelets not inrolled on the margins. 2 



2. Stems simple, axillary peduncles none; racemes stout; sheaths glabrous or 

 nearly so. P. laeve. 



2. Stems branched, the upper sheaths containing from 1-3 branches ; racemes 

 slender. 3 



3. Spikelets somewhat pubescent, tV in. long. P. setaceum. 

 3. Spikelets glabrous, nearly % in. long. P. muhlenbergii. 



1. Paspalum setaceum Mx. Slender Paspalum. A slender grass 

 with erect or ascending stems, ^-2^ ft. high, and with an inflor- 

 escence of 1-2 spike-like racemes. Spikelets ovate, somewhat pube- 

 scent, about 1/16 in. long; one of the empty glumes 3-nerved, the 

 other 2-nerved. 



In dry fields. Aug.-Oct. Cuyahoga County. 



2. Paspalum muhlenbergii Nash. Muhlenberg's Paspalum. A 

 tufted branching pubescent perennial grass with spreading or re- 

 clining stems, 1-2^4 ft. long, and an inflorescence of 1-2 spike-like 

 racemes. Spikelets glabrous, oval or broadly obovate, in pairs ; 

 lemma with inrolled margins ; empty glumes usually 3-nerved. 



In fields and sandy soil. Aug.-Oct. Cuyahoga, Erie, Warren, 

 Hamilton, Scioto, Guernsey. 



58. Chaetochloa Scrib. Foxtail-grass. 



Annual or perennial grasses usually with erect stems and flat 

 leaf blades, the inflorescence in spike-like panicles containing nu-. 

 merous persistent awn-like bristles on the rachis below the articu- 



