126 



GRAMINEAE. 



i. Ixophorus verticillatus (L.) Nash. Foxtail-grass. (Fig. 280.) 



Panicum verticillatum L- Sp. PI. Ed. 2, 82. 1762. 

 Selaria verticillata Beauv. Agrrost. 51. 1812. 

 Chamaeraphis verticillaia Porter, Bull. Torr. Club, 20: 



196. 1893. 

 Ixophorus verticillatus Nash, Bull. Torr. Club, 22: 422. 



1895- 



Culms erect or decumbent, i-2 tall, more or less 

 branched. Sheaths glabrous; leaves a'-S' long, 

 J^'wide, scabrous above; spikes 2 / -3 / long; spikelets 

 about \" long, equalled or exceeded by the down- 

 wardly barbed bristles; first scale less than one-half as 

 long as the spikelet, i-nerved; second and third scales 

 5-7-nerved, equalling the oval fourth one; palet of 

 third scale empty. 



About dwellings and in waste places, Nova Scotia and 

 Ontario to New Jersey and Kentucky. Naturalized from 

 Europe. July-Sept. 





2. Ixophorus glaucus (L. ) Nash. 



Panicum glaucnm L,. Sp. PI. 56. 1753. 

 Setaria glauca Beauv. Agrost. 51. 1812. 

 Chamaeraphis glauca Kuntze, Rev. Gen. PI. 767. 1891. 

 Ixophorus glaucus Nash, Bull. Torr. Club, 22: 423. 



1895- 



Culms erect or sometimes decumbent, i-4 tall, 

 more or less branched. Sheaths glabrous; leaves 

 2'-6' long, 2 // -4 / '' wide; spikes i'-4' long; spikelets 

 iX // -iX // l n gi oval, much shorter than the up- 

 wardly barbed yellowish brown bristles; first scale 

 i-3-nerved, somewhat shorter than the 5-nerved 

 second one; third scale 5-nerved, equalling the 

 fourth which is coarsely transversely rugose, very 

 convex, V-shaped in cross-section, about twice as 

 long as the second; palet of third scale usually 

 empty. 



In waste places and cultivated grounds, through- 

 out North America except the extreme north. Often a 

 troublesome weed. Naturalized from Europe. July- 

 Sept. 



3. Ixophorus viridis (L,.) Nash. 



Yellow Foxtail. Pigeon-grass. (Fig. 281.) 



Green Foxtail-grass. (Fig. 282. ) 



Panicum viridel,. Sp. PI. Ed. 2, 83. 1762. 

 Setaria viridis Beauv. Agrost. 51. 1812. 

 Chamaeraphis viridis Porter, Bull. Torr. Club. 20: 196. 



1893- 

 Ixophorus viridis Nash, Bull. Torr. Club, 22: 423. 1895. 



Culms erect or ascending, i-3 tall, simple 

 or branched. Sheaths glabrous; leaves 3 / -io / long, 

 2 // -6 // wide, usually scabrous above; spikes i'-Y 

 long; spikelets about \" long, elliptic, much shorter 

 than the green, or sometimes yellowish, upwardly 

 barbed bristles; first scale less than one-half as long 

 as the spikelet, i-3-nerved; second and third scales 

 5-nerved; fourth scale finely and faintly transversely 

 rugose, or pitted, striate, only moderately convex, 

 equalling or slightly exceeding the second; palet o 

 third scale usually empty. 



In waste places and cultivated grounds, through- 

 out North America except the extreme north, and often 

 a troublesome weed. Naturalized from Europe. July- 

 Sept. 



