1918] The Grasses of Illinois 353 



Sporobolus clandestinus (Spreng.) Hitchc. 

 Eough Rush Grass (Fig. 158) 



Agrostis aspera, Michaux '03, 52. Vilfa aspera, Lapham '57, 544, 563; Pat- 

 terson '76, 49; Flagg '78, 280; Brendel '87, 63. Sporobolus asper, Huett '97, 

 129; McDonald '00, 103. 



Culms 2 to 5 feet tall, smooth; sheaths smooth; blades long, nar- 

 row, involute except at the base, 3 to 15 inches long, 2 to 4 mm. wide ; 

 panicle 2 to 6 inches long, 2 to 4 mm. wide ; spikclets 6 to 8 mm. long, 

 the lemma pubescent near the base. 



This species is found in dry and sandy soil. It is distinguished by 



the exceedingly long, pointed palea. 



COOK CO. Leydon, Gates, peoria co. Peoria, McDonald, Sept., 1900 and 

 1901. 



Sporobolus cryptandms (Torr.) Gray 



Sand Dropseed (Fig. 159) 



Lapham '57, 545, 564; Patterson '76, 49; Flagg '78, 280; Brendel '87, 88; 

 Higley and Kaddin '91, 142; Huett '97, 129; Gleason '07, 182; Gleason '10, 148; 

 Gates '12, 355. 



Culms smooth, 1 to 2 feet tall ; sheaths short, smooth, with con- 

 spicuous long hairs at the throat; blades short, flat, rough on- the 

 upper surface, mostly crowded at the base of the plant, 2 to 5 inches 

 long, 3 to 5 mm. wide ; panicle open, somewhat resembling that of com- 

 mon redtop, in autumn contracted and partly included in the sheath; 

 spikelets usually dark colored, 2 to 2.5 mm. long. 



This species is very common along the shores of Lake Michigan and 



thruout the sand areas of the state. 



ILLINOIS SPECIMENS: Without locality, Vasey; Canteen lake, Eggert, Sept., 

 1886. CASS CO. Beardstown, McDonald, Sept., 1900. COOK co. Chicago, Vasey ; 

 Chicago, BabcocTc, Oct., 1874; Evanston, Johnston, Sept., 1886; Chicago, Lansing 

 371; Lake View, Chicago, TJmbach, Sept., 1898; Hyde Park, Chicago, A. Chase, 

 Aug., 1899; Evanston, Sherff, July, 1911. Henderson co. Oquawka, Patterson 

 in 1881. lake co. Beach Area, Gates 3255. la salle co. Ottawa, Seymour. 

 MASON CO. Manito, Wilcox, July, 1902; Havana, Gleason, Aug., 1903, ogle co. 

 Oregon, Waite, Sept., 1880. ST. clair co. Eggert, Oct., 1886. 



Sporobolus drummondii (Trin.) Vasey 

 (Figs. 160 and 161) 



Culms 1 to 2.5 feet tall, smooth; sheaths smooth; blades long and 

 narrow, flat at base, involute at tip, 3 to 15 inches long, upper surface 

 rough, sometimes pubescent near the base, but usually smooth ; panicle 

 seldom included in an inflated upper sheath, 3 to- 6 inches long, very 

 slender, loosely flowered, always less than half an inch wide ; spikelets 

 4 mm. long. 



This species is considerably smaller than 8. asper, which it closely 



resembles. 



ST. CLAIR CO. Mascoutah, Welsch. will co. Cougar's Prairie, Joliet, Slceels, 

 Sept., 1904. 



