338 American Midland Naturalist Monograph No. 7 



29. Deschampsia Beauv. — Hair Grass 



D. cespitosa (L.) Beauv. Moist soil along streams, rare; Kane and 

 Kankakee counties. 



30. Aira L. — Silver Hairgrass 

 A. coryophylUa L. Dry soil, rare; Piatt Co.. H. E. Ahles 2429. 



31. Avena L. — Oat 



1. Lemmas bearing stiff brownish hairs, at least at base; awn stout, 

 geniculate, strongly twisted; spikelets mostly 3-flowered; fields 



and waste places; nat. from Eur. May-July. Wild Oat 



A. fatua L. 



1. Lemmas glabrous; awn small, usually straight, or absent; spikelets 

 mostly 2-flowered : commonly cultivated; occasionally spontane- 

 ous. May-July. Oat A. sativa L. 



32. Arrhenatherum Beauv. — Tall Oat Grass 

 A. (latins (L. ) Mert. & Koch. Fields, roadsides, and waste places; 

 nat. from Eur. June- July. 



33. Danthonia Lam. & DC. — Curly Grass 



D. spicata (L.) Beau\-. Common throughout 111. in thin soil in 

 open woods, particularly on black oak and white oak ridges, forming 

 small dense clumps of curled leaves. May-July. 



34. Holcus L. — Velvet Grass 

 H. lanatns L. Roadsides and fields, occasional; introd. or adv. 

 from Eur., but scarcely established in 111. June-Aug. 



Tribe 5. Agrostideae. — Timothy Tribe 

 35. Calamagrostis Adans. 

 1. Panicle narrow biU loose, becoming somewhat open; spikelets 3- 

 3.5 mm long; blades flat, 4-8 mm wdde; marshy ground. June- 

 July. Blue-joint Grass C. canadensis (Michx.) Beauv. 



1. Panicle contracted, spike-like; spikelets 4-4.5 mm long; blades in- 

 volute, scabrous, 2-4 mm wide; moist ground, n. 111., Cook and 



Jo Daviess counties. June-Aug. NortheiTi Reed Grass 



C. inexpansa A.Gray 



36. Ammophila Host 

 A. breviligulata Fern. Beach Grass. Sand dunes along L. Michi- 

 gan. July-Aug. [A. arenaria .sensu auth., non Link], 



37. Calamovilfa Hack. — Sand Reed Grass 

 C. longifolia (Hook.) Scribn. Sand dunes along L. Michigan and 

 in sandy areas in the valleys of the Illinois and Mississippi rivers. 

 Aug.-Sept. 



