191S] The Grasses of IllincJis 289 



Paspalum muhlenbergii Nash 

 (Fig. 46) 



Culms usually erect, but often spreading or reclining, 16 to 32 

 « inches long, smooth ; sheaths usually pubescent ; blades long and nar- 

 row, 5 to 10 mm. Avide, usually wider near the middle, ciliate on the 

 margins, appressed pubescent on both surfaces ; racemes 1 or 2 ; spike- 

 lets in pairs, smooth, 2 to 2.5 mm. long. 



This species is generally found in sandy soil, along roadsides, in 

 vacant lots, and other uncultivated places. 



ILLINOIS SPECIMENS: Without locality, Fasey. christian co. Taylorville, 

 Andrews, jackson co. Without locality, French, July, 1878. macoupin co. 

 Carlinville, Robertson in 1881. marion co. Without locality, Brendel in 1860. 

 lEOHiA <o. I'ciuia. Brendd in ISoM. i ope < o. HpioiI, Clinton, July, ISilS. ST. 

 CLAIR CO. Without locality, Brendel; Mascoutah, Welsch. wabash co. Without 

 locality. Shearer. 



Paspalum repens Bcig. 



Water Paspalum (Figs. 36 and 47) 



Paspalum fluitans, Lapham '57, 548, 592; Patterson '76, 52; Flagg '78, 284; 

 Brendel '87, 88. Paspalum mucronatum, Britton '07, 73. 



Culms ascending, 6 to 36 inches long, much branched, the branches 

 spreading out at the base ; sheaths inflated, very loose, either smooth 

 or slightly pubescent ; blades 2 to 8 inches long, 6 to 25 mm. wide, very 

 thin, slightly rough ; racemes 10 to 40, the rachis flattened and mem- 

 branous; spikelets arranged in two rows, slightly pubescent, 1 to 1.5 

 mm. long. 



This species is usually found in water, Avith the stems floating, the 



iiiflated sheaths serving as floats. It is found sometimes in wet, muddy 



places. 



ILLINOIS SPECIMENS: Without locality, southern Illinois, Vasey; without lo- 

 cality, southern Illinois, Forbes. Henderson co. Oquawka, Patterson, Sept., 

 1877. JERSEY CO. Bottom lands, Grafton, Seymour, Oct., 1882. johnson co. 

 Belknap, Gleason, Aug., 1902. pulaski co. Mound City, Vasey. ST. clair co. 

 Without locality, Brendel, Aug., 1850; Mascoutah, Welsch. 



Paspalum setaceum j\lichx. 



(Fig. 48) 



Lapham '57, 592; Patterson '76, 52; Flagg '78, 284; Brendel '87, 88; Mc- 

 Donald 'UU, 1U;J; Gleason '07, 181; Gleason '10, 147. 



Culms usually erect, 1 to 2 feet long, smooth and slender; lower 

 sheaths and blades densely i)ubcscent; racemes usually single, occa- 

 sionally 2, on a long, slender peduncle ; spikelets in pairs, almost cir- 

 cular, 1.5 mm. long, usually pubescent and glandular spotted, but 

 sometimes smooth and glabrous. 



This species has been confused with P. mulilenhergii, Avhich has 

 much larger spikelets. Many of the herbarium specimens of P. 

 mxMeiibergii examined were labeled P. setaceum, so it is quite possible 

 that the citations above refer to both species. 



LEE CO. Dixon, Vasey. mason co. Without locality, Wolf; without locality, 

 Hall; Devil's Hole, Havana, Gates 3439. 



