PANICE^. 165 



serrate, 1-2 cm. long. Spikelets elliptical, acute or narrowly oval, 

 3.5 mm. long, glumes reticulate-veined, first glume broad, 1.5 mm. 

 long, 3-5-nerved, second 3 mm. long, 5-nerved ; floral glume of the 

 neuter floret like the second and empty glume, only a little longer, 

 its palea slender, 2 mm. long; fertile floret with faint transverse 

 ridges. Eesembling Hungarian grass. Index Kewensis in one 

 place includes this under ISetaria macrostachya. 



Pennsylvania, Scribner 3618; North Carolina, McCarthy; 

 Iowa, Hitchcock; Michigan, M. A. C. 22, 23, 24, Cooley, Clark 

 753. 



Florida, Curtiss 3617. 



Florida to Texas. 



9. C. GLAUCA (L.) Kuntze, Eev. Gen. PI. 767 (1891). Fox- 

 tail. Panicum glancnm L. Sp. PI. 56 (1753). Setaria glauca 

 Beauv. Agrost. 51 (1812). 



Culms erect, branching and compressed below, 30-60 cm. high. 

 Sheaths smooth, loose, the lower ones compressed and more or less 

 tinged with red ; blades scabrous, flat, twisted once or more around, 

 broad at the base, scabrous and, on large plants, often sparsely cili- 

 ate, 20-30 cm. long, 7-10 mm. wide. Spike simple, cylindrical, 

 usually tawny yellow, 3-10 cm. long, awnlike branches 6-13, with 

 the asperities directed upwards, 2-4 times as long as the sjaikelet. 

 Spikelets solitary, flat on one side, oval, obtuse or almost acute, 

 2.5-3 mm. long, first glume broad, one-half to two-thirds n,s long 

 as the spikelet, 3-nerved, second wider and a little longer, 5-uerved ; 

 floral glume of neuter floret as long as the spikelet, 5-nerved, its 

 palea nearly as long; fertile floret gibbous on one side, marked with 

 prominent transverse wrinkles. 



A common weed found in many parts of the world in which the 

 climate is temperate or tropical. Starts much later and flowers 

 much later in the season than C. viridis. 



District of Columbia, Vasey for U. S. Dept. Agricul. Ill; 

 Mexico, Pringh 431; Delaware, Canhy for Dr. Clark 1936; 

 Michigan, Clark 751, Beal 24; Alabama, Mohr. 



Var. laevigata (Muhl). Panicum Icevigatwn Muhl. Gram. 100 

 (1817). 



