1918] The Grasses of Illinois 343 



only Illinois specimens seen were collected on dry, gravelly hills, or on 



limestone rocks on a river bank. 



WILL CO. Joliet, Hill 185 in 1906; bank of Du Page river, Bird's Bridge, 

 Hill 36 in 1912. 



Muhlenberg-ia foliosa Trin. 



(Fig. 138)' 



Culms 2 to 3 feet long, often bent near the base and lying on the 

 ground, branched above the base, the branches erect, one or two inches 

 of surface below the nodes covered Avith very fine, short hairs ; sheaths 

 smooth; blades rough to the touch, 1.5 to 6 inches long, 2 to 5 mm. 

 wide ; panicles well beyond the uppermost sheath, usually rather thick, 

 campactly flowered; spikelets 2.5 to 3 mm. long, the glumes nearly 

 or quite equal to the lemma ; callus covered with soft hairs nearly half 

 as long as the spikclet. 



This species closely resembles 31. mexicana in general appearance 

 and habit. 31. foliosa can be readily distinguished by the minute hairs 

 on the culm just below the nodes. The panicles vary greatly in width. 

 The narrower panicles resemble those of 31 . umhrosa, which has long- 

 awned lemmas. There is an awnecl form of 31. foliosa, but no speci- 

 mens of it were found among the Illinois collections. The plants are 

 usually found in damp meadows and svv'amps. Most of the herbarium 

 specimens were labeled 31. mexicana filiformis. 



ILLINOIS specimens: Without locality. Ball, champaign co. Without lo- 

 cality, Burrill, Oct., 1877; Champaign, Clinton, Oct., 1895. fulton co. Without 

 locality, Wolf in 1881. JO daviess co. Bluffs of Apple river, Pepoon 611. 

 KANKAKEE CO. Waldron, Hill, Sept., 1873. mchenry CO. Algonquin, Nason, 

 Aug., 1879. PEORIA CO. Peoria, Brendel. piatt CO. White Heath, Kosher. Oct., 

 1914. STARK CO. Wady Pctra, V. H. Chase 1268. will co. Joliet, Sleels, Sept., 

 1904. WINNEBAGO CO. Fountaindale, M. S. Behh. 



Muhlenbergia glabriflora Scribn, 

 (Fig. 139) 



This species is very much like 31. foliosa in general appearance. 

 The culms are simple for nearly half their length, then branch pro- 

 fusely and bear numerous panicles, often partially included in the 

 upper sheaths, more typically cylindrical than in 31. foliosa. The 

 sjnkelets are of about the same size, but the callus bears no hairs, 

 making it very easy to distinguish the species. The leaf blades are 

 generally shorter than in ill. foliosa. The plants are found in woods 

 and other shady places. 



ILLINOIS specimens: Without locality. Wolf, christian co. Taylorville, 

 Andrews, Sept., 1898. menard co. Athens, Hall in 1868. ST. clair co. Mas- 

 coutah, Welsch. wabass co. Without locality, Shearer, Aug., 1898 and 1899, 



