Farmers' Bulletin No. 1439. Clean 36 page, illustrated bulletin stating, "From the original, wild stocks of the cabbage group have come cultivated cabbage, cauliflower, broccoli, brussel sprouts, kohlrabi, collards, and kale. Other cultivated plants closely related to those already mentioned are turnip, radish, rape, rutabaga, and horseradish. Among the related wild plants shepherds-purse, pepper-grass, and mustard are of most frequent occurrence. Mustard is sometimes cultivated, but some species grow so profusely under all conditions that they are more commonly classes as obnoxious weeds. The term "crucifers" as used in this bulletin refers collectively to all the vegetables and weeds mentioned in this paragraph, all of which belong to the botanical family Cruciferae, so-called from the form of the four-petaled flower. many of them are subject to the same diseases, so that the methods of control of the diseases of cabbage and its close relatives can often be applied to other crucifers as well."
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