Genus 21, 



GRASS FAMILY. 



1 6 5 



2. Chaetochloa glauca (L.) Scribn. Yellow Foxtail. Pigeon-grass. Fig. 391. 



Panicum glaucum 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. 

 Chaetochloa glauca Scribn. Bull. U. S. Dep.' Agr. Agrost. 

 4: 39. 1897. 



Culms erect or sometimes decumbent, i°-4° tall, 

 more or less branched. Sheaths glabrous; blades 

 2'-6' long, 2"-4" wide; spikes 1-4' long; spikelets 

 ii"-ii" long, oval, much shorter than the up- 

 wardly barbed yellowish brown bristles; first scale 

 1-3-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, throughout 

 North America except the extreme north. Often a 

 troublesome weed. Naturalized from Europe. Yellow 

 or Glaucous Bristly Foxtail. July-Sept. 



3. Chaetochloa imberbis (Poir.) Scribn. Per- 

 ennial Foxtail-grass. Fig. 392. 



Panicum imberbe Poir. in Lam. Encycl. Suppl. 4 : 272. 



1816. 

 C. imberbis Scribn. Bull. U. S. Dep. Agr. Agrost. 4 : 39. 



1897. 

 C. versicolor Bicknell, Bull. Torr. Club, 25: 105. 1898. 

 C. occidentalis Nash, in Britt. Man. 90. 1901. 



Culms single or somewhat tufted, from a branch- 

 ing rootstock, i°-3° tall; leaf-sheaths glabrous, com- 

 pressed, keeled; blades up to i° long and 4" wide, 

 glabrous, or nearly so; inflorescence i'-3' long, 

 7"-io" wide, the bristles 4"-6" long; spikelets 

 ij"-ii" long, the first scale about 4 as long as the 

 spikelet, 3-nerved, the second scale 3-5-nerved, the 

 third scale 5-nerved, the fourth scale strongly trans- 

 verse-rugose, elliptic, often purple-tipped. 



In moist or saline soil, Massachusetts to Kansas, south 

 to Florida and Texas. Also in tropical America, and in 

 the Bahamas. 



196 



4. Chaetochloa viridis (L.) Scribn 



Panicum viride L. Sp. PI. Ed. 2, 83. 1762. 

 Setaria viridis Beauv. Agrost. 51. 1812. 

 Chamaeraphis viridis Porter, Bull. Torr. Club, '. 



1893. 



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

 Chaetochloa viridis Scribn. Bull. U. S. Dep. Agr. Agrost. 



4: 39. 1897. 



Culms erect or ascending, i°-3° tall, simple or 

 branched. Sheaths glabrous; blades 3'-io' long, 2"-6" 

 wide, usually scabrous above; spikes i'-4' long; spike- 

 lets 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, 

 1-3-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, throughout North 

 America except the extreme north, and often a trouble- 

 some weed. Naturalized from Europe. Green Bottle-grass. 

 Wild Millet, Pigeon-grass. July-Sept. 



Green Foxtail-grass. Fig. 393. 



