9 



A. Seta; 5 to 16, involucrate. 

 ^Annual. 



1. Clisetocliloa glauca^ (L.) Scribn. U. S. Dept. Agr., Div. Agros. Bui 4: 39 (1897). 

 Paiikitiu glaurum L. Sp. PI. 56 (1753). Setaria gkiuca Beany. Agrost. 51 (1812). 

 Chamseraphis glauca Kuntze Eev. Gen. PI. 2: 767 (1891) . Ixophorus glaucus Nash 

 Bui. Torr. Bot. Club 22: 423 (1895). (Fig. 1.) 



All erect or ascending somewhat ctespitose, glaucous annual 3 to 12 dm. high, with 

 flat, lanceolate or linear-lanceolate leaves, and dense, bristly, cylindrical, spike- 

 like, yellowish panicles 2 to 10 cm. long. Culms branching at the base, genicu- 

 late, compressed, glabrous; 

 nodes brown, smooth ; sheaths 

 glabrous, loose, compressed, 

 • margins hyaline, smooth; 

 liguleshortjciliate; leaf blades 

 0.5 to 1.5 dm. long, 4 to 8 mm. 

 wide, long-acmninate, glau- 

 cous, nearly glabrous, or sca- 

 brous on the upper surface 

 and margins, generally pilose, 

 with scattered long white 

 hairs at the base. Panicles 

 dense, linear-ovate, obtuse, 

 about 1 cm. in diameter; 

 rachis angular, pubescent; 

 setie involucrate, 5 to 12 at 

 'each spikelet, straight, or 

 subflexuous, imequal, an- 

 trorsely scabrous, yellow, 3 

 to 8 mm. long. Spikelets 

 broadly ovate, 3 mm. long, 2 

 mm. broad, acute or obtuse; 

 first glume one-third to one- 

 half as long as the spikelet, 

 acute, 3-nerved ; second glume 

 one-half to two-thirds as long 

 as the spikelet, broadly ovate, 

 acute, 5-nerved, the mid-nerve 

 excurrent, the lateral ones 

 anastomosing with it; third 

 glume 5-nerved, equalmg the 

 flowering glume, subtending 

 a broadly-lanceolate, hyaline 

 palea nearly its own length; 

 flowering glume broad-ovate, 

 acute, 2.5 mm. long, striate, transversely undulate-rugose, the inclosed palea 

 broad, convex at the base, concave above, transversely striate. 



Li waste places and cultivated grounds widely distributed in North America. Natu- 

 ralized from Europe. July-September. 



Fig. 1. — Cheetochloa glauca: a, view of the spikelet showing 

 the setae ; 6, spikelet showing the lirst aud third glumes. 



• Ch^tochloa apiculata sp. nov. 



An erect, caespitose, perennial (?) , 2 to 4 dm. high, with rather rigid leaves, large 

 spikelets, and long, erect setje. Culms slender, slightly geniculate and generally 

 much branched at the base, glabrous or slightly scabro'us; nodes smooth^ sheaths 



