1D18] The Grasses of Illinois 321 



b]'anches ; blades 4 to 8 inches long, from 1.5 to 3 cm. broad, rough on 



both surfaces but not pubescent, ciliate on the margin at base ; spikelets 



2.7 to 3 mm. long, short pubescent. Autumnal form not very different 



except for the branching from the middle and upper nodes, and the 



much reduced panicles almost completel}^ hidden in the sheaths. 



This species is found in sandy soil, usually in moist situations. 



ILLINOIS SPECIMENS: Without locality, Wolf in 1882. christian co. Tay- 

 lorville, Andrews, May, 1898. fulton co. Canton, Wolf. JO daviess CO. Along 

 the Mississippi river, Pepoon .580. kankakee CO. Mt. Langham, near Kankakee, 

 Be Sehn, Sept., 191.3. peoria co. Peoria, Brendel; Peoria, McDonald, Sept., 1902 

 and 1903. union co. Anna, Seiimotir, Aug., 1880. vermilion co. Stony Crest, 

 Ihitts and Seymour, wabash CO. Without locality, Shearer ; Mt. Carmcl, Schneck, 

 June, 1885; Hanging Kock, Sclincch, May, 1906; Belmont, Schneclc, Oct., 1900. 



Panicum latifolium L. 



(Fig. 93) 



Lapham '.57, 548, 595; Babcock 73, 97; Patterson 76, 52; Flagg 78, 284; 

 Ilig'.ey and Raddin '91, LHD ; lluctt '97, 12S ; Hitt-heock and Chas-o 'lU, 314. 



Vernal form with a clump of stout culms 1.5 to 3.5 feet tall, 

 smooth ; the nodes not bearded, I'arely with a few hairs ; sheaths shorter 

 than the internodes, ciliate on the margin, otherwise smooth, or with a 

 few short, soft hairs on the lower sheaths ; ligule not visible ; blades 3 

 to 5 inches long, 1.5 to 4 cm. wide, usually smooth, but occasionally 

 with a few short hairs on one or both surfaces; spikelets 3.4 to 3.7 

 run. long, sparsely pubescent. Autumnal form as in P. clandestinum. 



This species is usually found in shady places. The plants are typ- 

 ically smooth, but some specimens are found with short hairs on 

 culms and sheaths. 



ILLINOIS specimens: Without locality, Vasey; without locality, M. S. Behh 

 in 1861. champaign co. Urbana, Waite in 1886; Ilrbana, Bittls and Setivwiir, 

 June, 1880. christian co. Taylorville, Andrews, May, 1894. COOK co. Beverly 

 Hills, Eohert Behh 882; Edgewater, Chicago, Gates, July, 1906; Hyde Park, Chi- 

 cago, Babcock, July, 1873. jo daviess co. Without locality, Pepoon, Aug., 1908. 

 LAKE CO. Antioch, Gleason and Shobe 268. mchenry co. Algonquin, Nasan. 

 MACON CO. East of Fishing Club, Clokey 2436. Marshall co. .Lawn Ridge, F. 

 H. Chase, July, 1907. menard co. Without locality. Hall in 1861. peoria CO. 

 Peoria, Brendel; Glasford, Wilcox 22, 41; Mossville, A. Chase 889; Peoria, Mc- 

 Donald 33. ST. clair co. Without locality, Eggert 239; Mascoutah, Welsch. 

 VERMILION CO. Muncie, Mosher, May, 1914. wabash CO. Without localit;^, 

 Schneck in 1879; Key's Hill, Schneck, June, 1905; Mt. Carmol, Schneck in 1878 

 and Aug., 1900; Hanging Eock, Schneck in 1879. 



The following species cited as having been found in Illinois have 

 not been seen : 



Panicum laxifiorum Lam. — This name is listed by Higley and Rad- 

 din ( '91, 139) and Huett ( '97, 128). It probably refers to P. dicliot- 

 omum, while the name P. diclioiomum was applied to the species of 

 Languinosa. 



Panicum nitidum Lam. — This name is listed by Huett ( '97, 128) 

 as occurring in Illinois. According to Hitchcock and Chase this species 

 is not found so far north. The name may refer to P. iipliaerocarpon. 



