1918] 



The Grasses of Illinois 



359 



Calamovilfa longifolia (Hook.) Hack. 

 Long-leaved Reed Grass (Fig. 172) 



Calamagrostis longifolia, Vasey '61, 671; Babcock '73, 97; Patterson '76, 50; 

 Flagg '78, 250; Higley and Kaddin '91, 143; Huett '97, 130; McDonald '00, 103. 

 Calamovilfa longifolia, Gleason '07, 182; Gleason '10, 148; Gates '12, 355. 



Culms single, not branched, smooth and stout, 1 to 6 feet tall ; 

 sheaths pubescent, at least near the base and on the margin ; ligule a 

 short fringe of hairs ; blades 9 to 18 inches long, involute, pointed at 

 the end ; panicle 6 to 18 inches long ; spikelets 6 to 7 mm. long. 



This grass is found in loose sands and is abundant along the shores 

 of Lake ]\Iichigan, where it acts as a sand binder. 



The typical form of the species, described from Saskatchewan, is 

 a less robust plant having a narrow, strict panicle. Eggert's St. Clair 

 collection is this typical form. The Oquawka and Lake Michigan speci- 

 mens are the robust form with large, open panicles which have been 

 distinguished as var. magna Scribn. and Merr. 



COOK CO. Without locality, along lake shore, Vasey ; Evanston, Shipman, July, 

 1875; Chicago, Vasey; Chicago, Lansing, July, 1898; Chicago, Babcock, August, 

 1874, HENDERSON CO. Near Oquawka, Patterson, lake co. Waukegan, Gleason 

 and Sliobe 322; north of Waukegan, Gates, 2920; Waukegan, Sherff. mason co. 

 Without locality, M. S. Bebb. ST. clair CO. Without locality, Eggert in 1882. 



174 



175 



Figs. 172-175. — Spikelets: 172, C. longifolia; 173, C. canadensis 

 inexpansa; 175, A. arenaria 



29. CALAMAGROSTIS Adans. 

 Reed Bent Grass 



These grasses are tall, with long, running rootstocks and panicles 

 which resemble those of Agrostis, especially A. alba. The spikelets are 

 one-flowered, the lemma and palea are thinner than the glumes, the 

 lemma awned on the back and surrounded with long hairs from the 

 short callus at its base. The leaves are long and narrow, the ligule 

 membranous with ragged edges. 



