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MANUAL OF POISONOUS PLANTS 



About 70 species of wide distribution. 



Bidens discoidea (T. & G.) Britton. Small Tickseed 



A diffusely branched annual from 1-2 feet high; leaves petioled, ternately 

 divided, leaflets ovate-lanceolate, pointed and serrate; rays wanting; disk 

 flowers yellow ; achenes narrow wedge-shaped, bearing a pair of short and stout 

 upwardly or downwardly barbed awns. 



Distribution. Common on wet banks throughout the northern Mississippi 

 Valley. 



Bidens frondosa L. Beggar-ticks. Stick-tights. 



A branching hairy or smooth annual from 2-6 feet high ; leaves petioled, 

 3-5 divided, the stalked leaflets lanceolate, pointed, coarsely toothed ; rays small: 

 and yellow ; involucre double, the outer f oliaceous, longer than the head ; re- 

 ceptacle flattish with deciduous chaff ; achenes wedge-obovate, 2-awned, the awns 

 downwardly barbed. 



Fig. 447a. Spanish Needle, Boot 

 Jacks {Bidens frondosa). The flatten- 

 ed achenes with downwardly barbed arms 

 more or less irritating. (Charlotte M. 

 King). 



Distribution. Widely distributed in moist places throughout the northern 

 states ; often a very troublesome weed in gardens. Widely scattered because 

 of the "seeds" adhering to clothing, pelts of animals, etc. 



Bidens bipinnata L. Spanish Needle 

 A smooth branched annual from 1-5 feet high; leaves petioled and 1-3 



