EXPERIMENT STATION BULLETINS. 



315 



Fig. 61 (58). 



Bough Pigweed. Red-root Pigweed. 



Amaranthus retroflexus L. Rough and more 

 or less pube.«;cent, rather light green, leaves 

 long petioled, ovate or rhombic-ovate, wavv 

 margined; spikes thick, crowded, stiff. Much 

 like the foregoing species; the prevailing one 

 in Michigan. Very common in annual crops 

 of corn, beets, beans, potatoes. Introduced 

 from tropical America. 



Fig. 62. 



Spiny Amaranth. Amaranthus spinosus 

 L. A smooth, bushy-branched annual, 30-100 

 cm. high, considerably resembling .4. retro- 

 flexus; leaves rhombic-ovate, dull green, 

 differing from others described in having a 

 pair of stiff spines at the base of each leaf. 

 Common soutn, but rare in Michigan. In- 

 troduced from tropical America. 



