414 



WEED FLORA OP IOWA 



glumes marked by dark, longitudinal lines ; seed brown, about one- 

 twelfth in. in length, marked at embryo by darker elliptical area. 

 Occurs in alfalfa and the clovers. 



Marsh Muhlenberg {Muhleniergia racemosa (Mx.) B. S. P.). 



Spikelets one-sixth to one-quarter in. long; lower glume acumi- 

 nate-pointed ; flowering glume acute, densely bearded at base, min- 

 utely pubescent and marked by black lines; seed slender, cylindri- 



Pigure 246B 



Fie.. 2460 



Pig. 246. Dropseed Grasses. A. Seed of Mexican Dropseed Grass (.Muhlen- 

 bergia inexicwna) . B. Spikelet of Marsh Muhlenberg (Jf. racemosa). C. 

 Nimble Will iM. schreberi). 



(Drawings by Charlotte M. King.) 



cal, brown, with black area at one end. Found in timothy and 

 clover seed. 



Nimble Will {Muhlenbergia schreberi J. F. Gmel.). 



Spikelet one-twelfth in. in length, as long as or longer than pedi- 

 cel ; empty glume minute ; lower sometimes absent ; flowering glume 

 lanceolate, slender, awned, scabrous on nerves. Found in clover 

 seed. 



Timothy {Phleum pratense L.). 



Flowering glume or larger scale marked by several veins, truncate 

 at top, shorter scale or palet also prominent; seed usually with 

 flowering glume; one-sixteenth to one-twelfth in. long; color light 



