GRASSES OF IOWA. 



53 



description. 

 Salt Marsh Cock- 

 spur Grass. Culms 3 

 to u feet (9-18 dm.) 

 tall, robust, smooth. 

 'The lower sheaths 

 usually papillose-hispid, 

 smooth beneath 01 scab- 

 rous above. Panicles 

 ample, 6-18 inches long, 

 consisting of numerous 

 ascending and spread- 

 ing branches; spikelets 

 ovate-lanceolate crowd- 

 ed in 2-4 rows on a 

 hispid rachis. Green- 

 ish or brownish. Sec- 

 ond and third glume 

 scabrous and hispid, 

 tipped with upwardly 

 barbeil awns. Fourth' 

 glume ovate-lanceolate, 

 acuminate. 



The Panicum Crus- 

 galli is considered var- 

 iable, but in none of its 

 forms does it seem to 

 approach the Panicum Walten of Pursh, and the latter may be regarded 

 as a good species as Nash has done in Britton & Broun, 111. Fl. 1: 113. 

 /'■ 244. 



■ A \* 



Fig. 38. Panicum Walteri.—a, spikelet: b, flowering 

 glume. (Charlotte M. KiDg. ) 



DISTRIBUTION'. 



Iowa. West Union (Whitmore) ; Columbus Junction, 15 12 

 (Pammel) ; Cedar Rapids (Hitchcock); Armstrong (Cram); 

 Marshalltown (Pammel); Iowa City (Hitchcock). 



North America. Illinois (Indian Lake; Pammel), Ohio (Hon). 

 Wisconsin (Parry). Also occurs in eastern and southern states, as far 

 west as Texas. 



4. PANICUM FILIFORMK. • 



Panicum Jilt forme L. Sp. PI. 57. 1753. Watson and Coulter, Gray 

 Man. Bot. 630. 1890. (6 ed ). Scribner. Grasses of Tenn. Bull. Univ. 



