THE GENERAL CHARACTERS OF SEEDS 413 



lar, striate lengthwise and with cross-ridges ;'. palea shining ; com- 

 monly brownish or greenish. In alfalfa, clovers and grass seed. 



, Whorled Millet {Setcuria verticillata (L.) Beauv.). 



Spikekts elliptical-ovate, one-twelfth in. long;_ first glmne tri- 

 angular-ovate, acute or obtuse, 3-nerved; second glume ovate, ob- 

 tuse, 5-7-nerved; third glume, 5-7-nerved, bears short palet in its 

 axil ; flowering glume about one-fifteenth in. in length, striate, near- 

 ly smooth; bristles about the fiower, 1 or 2, retrorsely scabrous, 

 one-twelfth to one-third in. long. Found in clover seed. 



Yellow Foxtail {Setaria glauca (L.) Beauv.). 



"Seeds" about one-eighth in. in length, very variable; color, 

 yellowish, brownish, or even palej; perfect flower with flowering 

 glume plano-convex, partially ' covering edges of palet; back of 



Figure 245A 



Figure 245B 



Fig. 245. Yellow Foxtail or Pigeon Grass (.Setaria glwuca). A and B, the 

 outer and inner faces, respectively, of a floret ; B, showing the palea. C 

 and D, the same showing the empty glumes of the spikelet ; C, showing the 

 second glume, and the first and third in part ; D, showing the first and 

 third glumes and the second slightly. E and F, the grain ; E, the convex, 

 embryo-bearing face ; F, the plane face. 6, a, group showing the natural 

 size. 

 Slightly enlarged spikelet. 



(A, after Hillman, Nevada Agr. Exp. Sta. Bull. ; B, drawing by Charlotte M. 



King.) 



B. 



flowering glume with prominent transverse branching ridges ; flow- 

 ering glume minutely granular. In alfalfa, clovers and grass seed. 



Mexican Dropseed {Muhleniergia mexicana (L.) Trin.). 



Spikelet about one-twelfth in. long, on very short pedicel ; empty 

 glumes nearly equal, acuminate; flowering glume lanceolate, 3- 

 nerved, scabrous on keel, pilose near base; sterile and flowering 



