346 Bulletin No. 20o [March, 



Muhlenbergia sobolifera (Muhl.) Tiin. 

 Rock Muhlcnborgia (Fig. 141) 



Lapham '57, 545, 566; Patterson '76, 49; Flagg '78, 280; Biendel '87, 63; 

 Higley and Eaddin '91, 141. 



Culms smooth, erect or nearly so, 1 to 3 feet tall; sheaths smooth; 

 blades rough, shorter on the culm, 1 to 6 inches long, 2 to 6 nun. wide; 

 panicles long and very slender ; spikclets 1.5 to 2.5 mm. long, the glumes 

 sharp-pointed and one-half to two-thirds as long as the lemma. 



This species is usually found in rocky woods. 



FULTON CO. Without locality, Pepoon. jo daviess co. Without locality, Fe- 

 poon. MACOUPIN CO. Carlinville, Bobcrison, Aug., 1882. menard CO. Alliens, 

 B]all in 1869. peoria CO. Peoria, Brendel. wabash Co. Without locality, 

 Schneelc, Oct., 1881; Mt. Carmel, Sclmeck, Sept., 1897. 



Muhlenbergia tenuiflora (Willd.) B. S. P. 

 Slender Muhlenbergia (Fig. 144) 



Muhlenbergia ■willdenotvii, Lapham '57, 545, 566 (Plate 1, Fig. 9) ; Babcock 

 '73, 97; Patterson '76, 49; Plagg '78, 280; Brendel '87, 63; Higley and Eaddin 

 '91, 141. 



Culms simple or very sparingly branched, covered with fine, short 

 hairs which point downwards ; nodes pubescent ; sheaths generally with 

 a few very fine hairs at least near the edges, usually shorter than the 

 internodes ; blades rough, 2.5 to 8 inches long, 2 to 8 mm. wide ; panicles 

 long and slender but rather densely flowered ; spikelets 3 to 4 mm. 

 long, glumes unequal, one-half to two-thirds the length of the lemma, 

 ■which bears an awn 2 to 4 times the length of the body. 



This species has the broadest leaves of any of the genus found in 



Illinois. They are usually horizontally spreading. It resembles 31. 



sobolifera more than any other species, but the larger spikelets and 



hairy culms easily distinguish it. The plants grow in rocky woods 



and other shady places. 



champaign CO. Urbana, Seymour and TVaite, July, 1886. cook go. Palos 

 Park, Vmbach, Aug., 1909. fulton co. Without locality, Pepoon. JO daviess 

 CO. Without locality, Pepoon. kane co. Elgin, Vasey. kankakee co. Kan- 

 kakee, De Selm, Sept., 1913. peoria co. Peoria, Brendel; Peoria, McDonald, 

 Sept., 1902; Glasford, Wilcox, Aug., 1902. wabash co. Mt. Carmel, SclinecTc in 

 1879; Hanging Rock, Schneck, Sept., 1904. 



Muhlenber^a umbrosa Scribn. 

 Wood Muhlenbergia (Fig. 145) 



Muhlenbergia s^ylvatica, Lapham '57, 545, 566; Babcock '73, 97; Patterson 

 '76, 49; Flagg '78, 280; Brendel '87, 63; Higley and Eaddin '91, 141; Huett 

 '97, 129. 



Culms usually much branched, 1 to 3 feet tall, with very fine, short 



hairs below the nodes; sheaths smooth; blades rough, 2 to 7 inches 



long, 2 to 6 mm. wide ; panicles long and very narrow, few-flowered ; 



spikelets, excluding the awn, 2.5 to 3 mm. long, glumes awn-pointed 



