Abstract
TRADE in plant products between widely separated countries has brought with it an interchange of the weeds of cultivated land. By the spread of Western civilisation to all parts of the world, there has resulted a preponderance of European weeds among the emigrants to other temperate regions. North America is no exception. A survey of this weed flora of the northern part of the United States shows that a large proportion of the adventive weeds are from Europe. The wide range of many weeds therefore renders a weed flora of more than local interest.
Weeds
By Prof. W. C. Muenscher. (Rural Science Series.) Pp. xxii + 577. (New York: The Macmillan Co., 1935.) 25s. net.
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Weeds. Nature 137, 600 (1936). https://doi.org/10.1038/137600c0
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DOI: https://doi.org/10.1038/137600c0