258 



WEED FLORA OF IOWA 



Wild Comfrey {Cynoglossum virginianum L.). 



Description. — Perennial hirsute herb with simple stem 2-3 ft. 

 high, leafless above; stem leaves lanceolate-oblong, clasping by a 

 heart-shaped base ; flowers on long peduncles, pale blue, small ; fruit 

 broad, nutlets not margined, convex on the upper surface. 



Distribution. — Common in woods of the central Mississippi val- 

 ley, New Brunswick to Ontario, Florida, Louisiana to Texas. Com- 

 mon in eastern to central Iowa near woods. 



Extermination. — Sometimes persistent in newly made fields in 

 the northern states. Cultivation for a few seasons will remove the 

 weed. 



Fig. 



148. Wild Comfrey {Cynoglossum virginianum). 

 (Photographed by Colburn. ) 



Woodland pastures. 



