1D18] 



The Grasses of Illinois 



301 



Panicum perlongum Nasli 

 (Fig. 62) 



Gleason '10, 14S ; Hitchcock and Chase '10, 153. 



Culms as in the preceding species ; sheaths usuall}^ densely pubes- 

 cent, very seldom smooth; blades 2 to 10 inches long, 2 to 4 mm. wide; 

 panicles very small, but appearing densely flowered ; spikelets blunt, or 

 if appearing beaked, the points of the second glume and sterile lemma 

 not extending beyond the fruit, 2.7 to 3.3 mm. long, often pubescent. 



This species closely resembles P. depauperatum, but the spikelets 



do not have a beak prolonged beyond the fruit, and the leaves are 



longer and narrower. P. depauperatum. has very few panicles in the 



autumn, while P. perlongum has a great many. It is a prairie species 



and grows in dry soil. 



ILLINOIS SPECIMENS: Without locality, Bahcoclc; without locality, Wolf. 

 CHAMPAIGN CO. Urbaiia, Seymour, May, 1880. Henderson co. Oqiiawka, Pat- 

 terson. JO DAVIESS CO. Hanover, Gleason and Gates 2530. lake CO. Beach, 

 Gates 2454; Waukegan, Gates 2472. peoria co. Peoria, McDonald, stark co. 

 Wady Potia, J'. H. Chaise 4(i0, 1456, 1511. will to. Joliet, Eill, Juno, 1907; 

 Joliet, Skeels, June, 1904. 



62 



63 



Figs. 62-64.— Spikelets: 62, P. perlongum; 

 depauperatum 



64 



63, P. Unearifoliiim; 64, P. 



Panicum linearifolium Rcribn. 

 (Fig. 63) 



Hitchcock and Chase '10, 155. 



Culms 8 to 18 inches long, very slender, seldom pubescent ; sheaths 

 usually densely pubescent; blades 4 to 15 inches long, often longer 

 than the panicles, 2 to 4 mm. wide ; panicles larger than in the two 

 preceding species ; spikelets 2.2 to 2.7 mm. long, often with a few soft 

 hairs. 



This species is best distinguished by its smaller, narrower spikelets, 

 but the leaves are typically much longer and narrower and not so 

 stiff as in the preceding species. It grows in dry woods. 



COOK CO. Glencoe, Gates, June, 1907. du page co. Wheaton, Moffedt, July, 

 1893. JACKSON CO. Makanda, Gleason, June, 1903. st. clair co. Maseoutah, 

 IVelsch. UNION CO. Cobden, Waite, June, 1885. 



