DESCRIPTIVE MANUAL 

 Ball Mustard (Neslia paniculata (L.) Desv.), 



163 



Description. — An erect, slender annual or biennial, 1-3 ft. high 

 with stem simple up to the inflorescence ; stem and leaves, both 

 being covered with stellate pubescence; sessile leaves oblong, very 



Fig. 91-C. Ball Mustard (Neslia paniculata) ; a, flowering stem ; b, pod ; c, seed. 

 (Schuyler Mathews in Mich. Agr. Exp. Sta. Bull.) 



narrow, sagittate at base; racemes elongate; flowers small, yellow, 

 about Yg in. in diameter; seed-pods nearly spherical, 2-celled with 

 1 small yellow seed in each cell, sometimes but one developing. 



Distribution. — In grain fields, Canada, the Dakotas and occa- 

 sionally in northwestern Iowa. 



Extermination. — Clean seed; easily destroyed by cultivation. 



