GENUS 21. 



GRASS FAMILY. 



165 



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



Panicum glaiiciun L. Sp. PI. 56. 1753. 

 Set aria glauca Beauv. Agrost. 51. 1812. 

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

 Lvophonis glauciis 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 i'-4' long; spikelets 

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

 wardly barbed yellowish brown bristles ; first scale 

 l-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. vcrsicolor 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; kaf-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 

 ii"-ii" long, the first scale about i 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. 



4. Chaetochloa viridis (L.) Scribn. Green Foxtail-grass. Fig. 393. 



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



Set aria riridis Beauv. Agrost. 51. 1812. 



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



1893- 



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

 Chaetochloa riridis 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 i" 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, 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. 



