48 



GRASSES OF IOWA. 



generally two, rarely more than two. In this case they are 

 generally described as sterile flowers as in such genera, 



Panicum and Andropo- 

 gon. This question is 

 discussed more at length 

 by Hackel and Scrib- 

 ner.* 



The glumes may be 

 awned or "bearded," or 

 awnless; they may be 

 sharp-pointed, obtuse or 

 toothed at the apex; they 

 may be nerveless or one 

 to many-nerved. As to 



Fig. 39 B. Zea may» a single 

 spllcelet with staomtDs. 



other variations it is 

 necessary to refer the 

 reader to the larger de- 

 scriptive works on bot- 

 any. 



Opposite the palea and 

 above the flowering 

 glume occurs two small 

 dedicate scales known as 

 the lodicules. Sometimes 

 there are more than two, 

 sometimes they are want- 

 These lodicules stand close together. In the front they are 



♦English translation True Grasses, from Die Natuerlichen Pflanz«nfamilien. See 

 also Bentham, Notes on Gramlneae. Linnean Soc. Jour. Bot., 19: 22. 



Fig. 39 A. Zea mays. To the left, pistil; g. 

 oyary; s, stigma; to the right, f, flowers; s, 

 staemens. 



mg. 



