EXPERIMENT STATION BULLETINS. 



301 



Fig. 40 (41). 



Narrow-leaved Dock. Curled Dock. Rumex crisvus L. Perennial with a deep tap root, 

 smooth, rather slender, erect, 90-160 cm. high; leaf-blades cordate, lanceolate, acute, with wavy- 

 curled margins; panicle rather open; flowers rather loosely whorled, valves circular, heart-shaped, 

 nearly entire, 2.5-3.5 mm. long, each bearing a tubercle. Very common and well known as a 

 bad weed. Introduced from Europe. Not difficult to manage with a good rotation of crops. When 

 it appears in a meadow, wait till the stem runs up and gets some strength, before seeding. When 

 the ground is soft, thrust a spade erect near the plant, prying with spade and pulling with the 

 other hand and out comes all the main root. 



