MICHIGAN WEEDS. 



431 



Fig. 229. 



Jerusalem Artichoke. Helianthus tuberosus L. Stem rough, stout, branched 120-300 cm. high, 

 perennial by numerous tubers; leaves ovate or narrow, three-nerved, sharp pointed; rays 12-20, yel- 

 low, occasionally cultivated and spreading as a weed. 



