1918] 



The Grasses of Illinois 



317 



surface near the base ; spikclets with long pedicels, 3.5 to 4 mm. long, 

 sparsely pubescent. Autumnal form branching mostly from the upper 

 nodes, often becoming top-heavy and lying on the ground ; leaves much 

 smaller and panicles reduced to a few spikclets. 



This species is found in sandy soil usually in moist situations. The 

 plants are olive green, very often deeply tinged with purple. 



ILLINOIS SPECIMENS: Without locality, Schneclc. 



87 



Figs. 86-88.— Spikelets: 86, P. 

 gosanthes; 88, P. scribnerianinn 



leibcrgii; 



Panicum scribnerianum Nash 



(Fig. 88) 



Gleason '10, 148; Hitchcock and Chase '10, 283; Glcason '12, 48; Gates '12, 

 354. 



Vernal form with the culms in fairly large tufts, usually somewhat 

 spreading, 8 to 20 inches tall, generally smooth; nodes not bearded; 

 sheaths papillose-pubescent; ligules about 1 mm. long; blades 2 to 4 

 inches long, G to 12 mm. wide, usually ciliatc on' the margin, some- 

 times Avith a few short hairs on the under surface, otherwise smooth ; 

 panicles small, the length and breadth about equal; spikelets 3.2 to 

 3.3 mm. long, sparsely pubescent or almost smooth. Autumnal form 

 branching from the middle and upper nodes, the leaves slightly re- 

 duced, partially concealing the small panicles. 



This is a typical prairie species found in dry or sandy soil. It 

 is probably one of the commonest species of perennial Panicum found 

 in Illinois. 



CHRISTIAN CO. Tayloiville, Andrews, June, 1899. coOK CO. Chicago, A, 

 Chase 1607; Chicago, Greenman, Lansing, and Dixon 156. henry co. Galva, V. 

 H. Chase 1749. JO daviess co. Without locality, Pepoon 185; Hanover, Gleason 

 and Gates 2598. lake co. Beach, Umbach 2365; Waukegan, Gates in 1909. 

 MACON CO. Near Decatur, CloTcey 2438. Marshall co. Without locality, V. H. 

 Chase 1792. peoria co. Peoria, McDonald, June, 1890. stark CO. Wady Petra, 

 ('. H. Chase 922. vermilion co. Muncie, Mosher, May, 1914. wabash CO. 

 Without locality. Shearer. 



