146. Gramineae 351 



1. Pedicels and lacliis pilosulous. 



2. Fruit 2-2.5 inni long, the awn only 1 nun long; panicle con- 

 tracted, the racemes appressed; roadsides and along ditches, 

 occasional, Jackson and Union counties; adv. in 111. from 



s.w. U.S. July-Oct E. contracla Hitchc. 



2. Fruit about 3 mm long, apiculate; panicle-branches ascending 

 or spreading; (ields. Union Co., R. A. Evers. Adw from s.w. 

 U.S. E. gracilis (Fouin.) Hitchc. 



^>' 



7 1 . Echinochloa Beauv. 



1. Slieaths glabrous or nearly so; spikelets ovoid. 



2. Racemes 2-10 cm long, crowded and fascicled; spikelets 3-4 

 mm long, awned or nearly awnless; fields, roadsides, waste 

 groimd, river banks, common; nat. from Eurasia. July-Sept. 

 Barnyard Grass. [E. rnuricata (Michx.) Fern.; E. pungens 

 (Poir.) Rydb.]. Japanese Millet or Billion-dollar Grass, var. 

 jrurnentacca (Roxb.) Wight, with awnless spikelets and 



dense purple or brown panicles, occurs occasionally 



-- E. crusgalli (L.) Beauv. 



2. Racemes 8-18 mm long, distant; spikelets 2.5-3 mm long, 

 merely apiculate, crowded in about foiu' regular rows; moist 

 ground, occasional; adv. from the s. states; Chicago, F. A. 



Swink in 1947. Jungle-rice E. colonum (L.) Link 



1. Sheaths, at least the lower ones, usually strongly papillose-hirsute, 

 or rarely merely |:)apillose; panicle dense, the ellipsoid spike- 

 lets conspicuously long-awned, purple at maturity, the awns 



1.5 cm long; wet ground, local. Aug.-Oct 



E. walteri (Pursh) Heller 



72. Setaria Beauv. 



I. Plants perennial with short branched rhizomes; bristles below 

 each spikelet 8-12, yellowish or purplish, upwardly scabrous; 

 waste ground, occasional; Fayette, Jackson, Marion, and 



Mason counties S. gcniculata (Lam.) Beau\-. 



1. Plants annual. 



2. Bristles retrorsely scabrous, 3-6 mm long; weed in waste ground, 

 chiefly about towns; nat. from Eur. July-Sept. Bristly 



Fo.xtail S. verticillala (L.) Beau\-. 



2. Bristles antrorsely scabrous. 



3. Leaves loosely pubescent above; spikelets 2.7-3 mm long; 

 panicles curved, nodding, 2-3 cm thick, 10-17 cm long; 

 a serious weed in fields and along roads; recently nat. from 



Asia. July-Oct. Giant Foxtail S. faherii Herm. 



3. Leaves glabrous on both sides. 



4. Spikelets about 2 nun long; panicles erect or nearly so, 

 3-10 cm long; a common weed throughout 111.; nat 



from Eur. June-Sept. Green Foxtail 



S. viridis (L.) Beauv. 



