WEEDS ON THE FARM. 



821 



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St. John's Wort (Hypericum perforatum Liim.). 



a. Flowering stem. b. Fruit, consisting of 3 carpels. Part of the calyx removed, c. Horizontal 

 section through ovarium, showing the attachment of the seeds and the large oil-glands, d. Seed, with 

 reticulate testa, b. Petal, showing the dark oil-glands, k. Part of the stem, j Flowers yellow .) 



