MICHIGAN WEEDS. 



313 



Fig. 41 (44). 



Willow-leaved. Dock. Rumex mexicanus Meisn. (R. salicifolius.) A smooth, 

 light green, erect, perennial, 30-90 cm. high, with a strong tap root: leaves linear- 

 lanceolate; panicle very dense; calyx deltoid-ovoid; about 3 mm. long: tubercles three, 

 large; achene dark red. shining. Native of North Eastern North America. Widely dis- 

 tributed, not yet common in Michigan. 



