1918] The Grasses of Illinois 361 



is a long, densely flowered, spike-like panicle, with one-flowered spike- 

 lets. The glumes, lemma, and palea are firm in texture, and the callus 

 bears a ring of short hairs. 



Ammophila arenaria (L.) Link 

 Sea Sand Grass. Psamma. Marram. Beach Grass (Fig. 175) 



Calamagrostis arenaria, Vasey, '61, 671; Babcock '73, 97; Patterson '76, 50; 

 Flagg '78, 280. Ammophila arundinacea, Higley and Raddin, '91, 143; Cowles, 

 '00, 171. Ammophila arenaria, Gates '12, 355. 



Culms smooth, 2 to 4 feet tall ; sheaths smooth ; blades 6 to 12 inches 

 long, rough on the upper surface, narrowed and involute, ending in 

 a sharp point ; spikelets flattened and rough, 10 to 15 mm. long. 



COOK CO. Shoi'cs of Lake Michigan, Vasey ; shores of Lake Michigan, Scam- 

 mon, Sept., 1860; Chicago, BahcocTc, July, 1874; Evanston, Shipman, July, 1879. 



31. CINNA L. 

 Wood Reed Grass 



These grasses arc tall and slender, the culms growing singly or a 

 few together. The inflorescence is of many-flowered panicles. The 

 spikelets are one-flowered, flattened, and keeled, the glumes narrow; 

 the lemma bears a minute awn just below the apex, but there are no 

 hairs at the base. The palea is one-nerved or the two nerves are so 

 close together as to appear one. The leaves are flat, the ligulcs brown, 

 membranous, almost transparent, 5 to 6 mm. long. 



Spikelets 3 to 4 mm. long; awn 1 to 2 mm. long; first and second glumes about 

 equal. C. latifolia 



Spikelets 5 to 6 mm. long; awn about .5 mm. long; first glume much shorter than 

 the second. C. arundinacea 



Cinna arundinacea L. 



Indian Reed (Figs. 176 and 177) 



Lapham '57, 545, 565; Babcock '73, 96; Patterson '76, 49; Flagg '78, 280; 

 Brendel '87, 63; Higley and Raddin '91, 143. 



Culms 2 to 5 feet tall, smooth ; sheaths smooth ; blades 6 to 12 

 inches long, 4 to 15 mm. Avide, slightly roughened ; panicle usually 

 densely flowered, the numerous branches ascending, the ends nodding; 

 spikelets 5 to 6 mm. long, tho glumes unequal, rough, the lemma with 

 a minute awn or awnless. 



This grass is found in moist, shady situations, especially in the 

 woods. It is said to furnish excellent hay where it grows abundantly 

 along the borders of streams. 



ILLINOIS SPECIMENS: Without locality, Vasey. champaign co. Urbana, 

 Clinton, Sept., 1899; Urbana, Seymour, July, 1880; Urbana, Seymour and Waite, 

 July, 1886. CHRISTIAN CO. Taylorville, Andrews. cooK CO. River Forest, A. 

 Chase, Sept., 1900 ; Evanston, Shipman, Aug., 1875 ; Chicago, Moffatt, Aug., 1892. 

 FULTON CO. "Without locality, Pepoon. Henderson co. Oquawka, Patterson. 

 JACKSOX CO. Without locality, French in 1878; without locality, Lapham in 1857. 



