Jones: Flora of Illinois, 22. Gramineae 57 



27. Danthonia Lam. &: DC. — Oat Grass 

 D. spicatd (L.) Beauv. Thin soil in open woods. June-July. 



28. HoLCus L. 



{Notholcus Nash) 

 H. lanatus L. Velvet Grass. Roadsides and fields, occasional; nat. from 

 Eur. June-Aug. 



29. Calamagrostis Adans. — Reed Grass 

 1. Panicle narrow but loose, becoming somewhat open; spikelets 3-3.5 mm. long; 



blades flat, 4-8 mm. wide; marshy ground. June-July. Blue-joint Grass 



C. canadensis (Michx.) Beauv. 



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

 brous, 2-4 mm. wide; moist ground, n. III. June-Aug. Northern Reed Grass 

 C. inexpansa Gray 



30. Ammophila Host 



A. breviligulata Fern. Beach Grass. Sand dunes along L. Michigan. July- 

 Aug. [/I. ctrenaria sensu auth., non Link}. 



3L Calamovilfa Hack. 

 C. longifolia (Hook.) Scribn. Sand dunes along L. Michigan. Aug-Sept. 



32. Agrostis L. — Bent Grass 

 L Lemma awned; spikelets L5 mm. long; fields and open woods, s. 111. May- 

 June A. elliott'tana Schult. 



L Lemma awnless; spikelets 2-3 mm. long. 

 2. Palet evident, about half the length of the lemma; plants perennial, 30- 

 120 cm. tall, with strong, horizontal rhizomes; roadsides and fields, 

 very common. June-Aug. \_A. palustris sensu auth., non Huds.] Red- 

 top A. alba L. 



2. Palet lacking or minute. 



3. Panicle very diffuse, 15-60 cm. long, the branches scabrous, 5-15 cm. 

 long, spikelet-bearing near the ends; roadsides and fields. May-July. 



Tickle Grass A. scabra Willd. 



3. Panicle open but not diffuse, 10-20 cm. long, the branches smooth; 



woods. Aug.-Oct. Autumn Bent Grass 



A. perennans (Walt.) Tuckerm. 



33. CiNNA L. 

 1. Spikelets 5 mm. long, the awn 0.5-1 mm. long; panicle rather dense, the 



branches ascending; moist woods and borders of streams. July-Sept 



C. arundinacea L. 



1. Spikelets 3-4 mm. long, the awn 1-2 mm. long; panicle loose, the branches 



spreading or drooping; moist woods, n. III. July-Sept 



C. latifolia (Trev.) Griseb. 



34. Alopecurus L. — Foxtail 

 1. Spikelets 5-6 mm, long; plants perennial; fields and meadows; nat. from 

 Eur. June-July. Meadow Foxtail A. pratensis L. 



