DESCRIPTIVE MANUAL 



277 



Fig. 160-A. Distribution of Motherwort. 



per crenate at the base, 3-cleft; flowers pale purple, in close axil- 

 lary whorls; corolla bearded. 



Distribution. — Native to Europe, widely naturalized in the north- 

 ern states. 



Extermination. — This perennial weed can be exterminated by 

 plowing the field with frequent cultivation subsequently. 



Blue Sage (Salvia lanceaefolia Poir.). 



Description. — A slightly pubescent or nearly smooth annual, 

 l-2y 2 ft. high; leaves petiolate, lanceolate serrate or nearly entire; 

 flowers in interrupted, erect spikelike clusters; calyx bilabiate, 

 upper entire, the lower 2-cleft; corolla, blue, slightly exserted; 

 stamens with long connective, attached to a sterile anther which 

 blocks the throat of the corolla; pistil 1, deeply 4-lobed. Plant 

 related to the cultivated garden salvias. 



Distribution. — Chiefly west of Missouri river, Kansas, Nebraska, 

 Texas, and Arizona, Missouri and Indiana, introduced in Ohio. 

 Common in Pottawattamie, Fremont, Monona and Woodbury coun- 

 ties, less common in Story, Boone, Polk and Muscatine counties. 



Extermination. — This weed is easily exterminated by cultivation. 

 Do not allow the plant to produce seeds. 



SOLANACEAE, NIGHTSHADE FAMILY. 



Potato, tomato, tobacco, ground cherry, jimson weed, flowering 

 tobacco and black henbane, belong to this family. 



