1918] 



The Grasses of Illinois 



287 



Paspalum circulare Nash 

 Round-flowered Paspalum (Fig. 41) 



Culms erect or slightly reclining, 1 to 2.5 feet long, smooth ; sheaths 

 flattened, the lower ones densely pubescent; blades long, 'narrow, 5 

 to 8 mm. wide, with long hairs on the upper surface near the base, 

 usually smooth and glabrous on the under surface, but sometimes with 

 a few long hairs ; racemes 1 to 4, usually 2 or 3 ; spikelets arranged 

 singly, smooth, circular in outline, 3 to 3.2 mm. long. 



This species is usually found in moist places. It resembles P. 

 laeve, from which it may be distinguished by the pubescent sheaths 

 and larger spikelets. 



CLINTON CO. Shattuck, Waite, Aug., 18S7. ST. clair co. Without locality, 

 Brendel, wabash co. Mt. Carmel, Patterson, Sept., 1877. 



42 



43 



Figs. 39-44. — 39, P. iushii, spikelets, (a) glandular hairs; 40, P. ciliati- 

 folium, spikelets; 41, P. circulare, spikelet; 42, P. dissectum, spikelet; 43, 

 P. laeve, spikelet; 44, P. longepedunculatum, spikelets 



Paspalum dissectum L. 

 Walter's Paspalum (Figs. 35 and 42) 



Paspalum walterianum, Patterson '76, 52; Flagg '78, 284: Brendel '87, 88. 



Culms much branched, usually spreading along the ground at the 

 base and often rooting at the lower nodes, 1 to 2 feet long, the flowering 

 culms erect or ascending; sheaths somewhat inflated, smooth; blades 

 always less than 3 inches in length, usually much shorter, smooth; 

 racemes 3 to 7, alternate, about an inch in length, usually partly in- 

 cluded in the upper sheath, racliis flattened, green and membranous, 

 2 to 3 mm. wide ; spikelets arranged in two rows, smooth, oval, 2 to 

 2.2 mm. long. 



This species is found in damp or wet places along ditches and 

 streams. 



PERRY CO. Du Quoin, Eggert in 1893. pulaski co. Mound City, Brendel, 

 Aug., 1853. ST. clair CO. Without locality, Brendel in 1850; -without locality, 

 Brendel, Aug., 1851; Mascoutah, Welsch. 



Paspalum laeve Michx. 

 Field Paspalum. Smooth Paspalum (Fig. 43) 



Paspalum laeve, Lapham '57, 548, 592 (Plate 4, Fig. 3); Patterson '76, 52; 

 Flagg '78, 284; Brendel '87, 88. 



• Culms sometimes erect but oftener spreading, or even lying flat 



