126 
GRAMINEAE. 
Ixophorus verticillatus (L.) Nash. Foxtail-grass. (Fig. 280. ) 
Panicum verticillatum ¥,. Sp. Pl. Ed. 2, 82. 1762. 
Setaria verticillata Beauv. Agrost. 51. 1812. 
Chamaeraphis verticillata Porter, Bull. Torr, Club, 20: 
196. 1893. 
Ixophorus verticillatus Nash, Bull. Torr. Club, 22: 422. 
1595. 
Culms erect or decumbent, 1°-2° tall, more or less 
branched. Sheaths glabrous; leaves 2’-S’ long, 4 /— 
%4/ wide, scabrous above; spikes 2/3’ long; spikelets 
about 1/’ long, equalled or exceeded by the down- 
wardly barbed bristles; first scale less than one-half as 
long as the spikelet, 1-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 (I,.) Nash. Yellow Foxtail. Pigeon-grass. (Fig. 281. ) 
Panicum glaucum I,. Sp. Pl. 56 
Selaria glauca Beauy. Agrost. 5 
Chamaeraphis g glauca Kuntze, Rev. Gen. 
Ixophorus glaucus Nash, Bull. Torr. 
1895. 
1753: 
Culms erect or sometimes decumbent, 1°—4° tall, 
I. 1812. 
Pl. 767. 1891. 
Club, 22: 423. 
more or less branched. Sheaths glabrous; leaves 
2/-6/ long, 2’’-4’’ wide; spikes 1/—4/ long; spikelets 
1%{/’/-1%’’ long, 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. Oftena 
troublesome weed. Naturalized from Europe. July- 
Sept. 
3. Ixophorus viridis (L.) } 
Nash. Green Foxtail-grass. 
Panicum viride I,. Sp. Pl. Ed. 2, 83. 1762 
Selaria viridis Beauv. Agrost. 51. 1812. 
Chamaeraphis viridis Porter, Bull. Torr. Club, 20: 196. 
1893. 
beharus viridis Nash, Bull. Torr. Club, 22: 423. 1895. 
Culms erect or ascending, 1°-3° tall, simple 
or branched. Sheaths glabrous; leaves 3’—10’ long, 
2//-6/’ wide, usually scabrous above; spikes 1/—4/ 
long; spikelets about 1’’ 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 of 
third scale usually empty. 
In waste places and cultivated grounds, through- 
out North America except the extreme north, and often 
atroublesome weed, Naturalizedfrom Europe. July- 
Sept. 
