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HYPERICUM PERFORATUM 
ST.JOHNS WORT 

T. JOHN’S-WORT (Hypericum perforatum)—This is an introduced 
perennial noxious weed that spreads both by seeds and lateral branching 
from the base of the stem. It grows to a height of two to three feet, and 
grows chiefly in meadows, pastures, waste places, and fields, that are not well 
cultivated. The young plants have a juice which is very sour and blistering 
so that no animals will eat it. The flowers are yellow about 34 inches across, 
the many stamens are in 3 groups. The leaves, when closely examined, are 
seen to be filled with numerous small clear spots. The stem is much branched 
and somewhat woody when mature. The plant is quite widely distributed in 
North America except in the far north and south. St. John’s-wort is best con- 
Isolated 
trolled in large quantities by clean cultivation of intertilled crops. 
plants should be pulled or grubbed out following a heavy rain or wet season. 
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