GRASSES OF IOWA. 83 



DISTRIBUTION. 



Iowa. Muscatine, 2281 (Reppert.) ; LuVerne, 2268 (Blumer) ; 

 2331 Steamboat Rock, Boone 2326, Steamboat Rock 2163, Des 

 Moines, 2256 Bloomfield (Pammel) ; Boone (Carver) ; Armstrong, 

 1067 (Cratty) ; Ames (Bessey, P. H. Rolfs, 157, Ball) ; 1139, Durant 

 (Weaver) ; Mt. Pleasant (Mills, Witte) ; Fayette, 1087 (Fink) ; Sioux 

 City, Iowa City (Hitchcock); Ames 11 (Beardslee); Unionville 

 (Shimek). 



North America. New Brunswick to the Pacific Coast and south to 

 Texas. 



OTHER SPECIES OF PANICUM. 



Several other species of Panicum range westward to Wisconsin 

 and Minnesota and may be looked for in eastern Iowa. Among them 

 Panicum barbulatum, P. clandestinum, P. commutatum, P. dichotomum 

 and P. sphaero carport (P. polyanthes Schult). These are described by 

 Scribner and Merrill Rhodora 3: 93. 



3. SETARIA. 



Setaria Beauv. Agrost. 113. 1812. Engler and Prantl. Nat. Pflanz. 

 Fam. II. 2: 36. /. 29. Bentham and Hooker, Gen. PI. 3: 1105. 



Pennisetum Endlicher. Gen. PI. 85. Pers. Svn. 1: 72. in part. 



Ixobhorus Schlecht. Linnaea. 31:420. 1861-2. Nash. Bull. Torr. Bot. 

 Club. 22: 423. 1895. 



Chaetochloa Scribn. Bull. U. S. Dept. Agrl. Div. Agros. 4: 38. 

 1897. 



Chamieraphis Kuntze. Rev. Gen. 767. (Not the Chamaeraphis of R 

 Br.) 



Spikelets as in Panicum, but surrounded at the base by few or many 

 persistent, awn-like bristles (aborted branches) which spring from 

 pedicels below the articulation of the spikelets. Inflorescence a 

 densely many-flowered, cylindrical, or somewhat interrupted, 

 spike-like panicle. Annuals with flat leaves and terminal, 

 bristly, spike-like panicles. 



Bentham & Hooker give the number of species as 10; the same 

 number is given by Hackel. In temperate and tropical regions. All of 

 our Iowa species are from the Old World. 



