Barnyardgrass [Echinochloa crus-galli(L.) Beauv. ♯3ECHCG], originally from Europe and India, now ranges from latitude 50 N to 40 S, in both temperate and tropical habitats (12). It is a serious weed problem in 42 countries and is found in at least 27 more (11). It is the world's principal weed of rice (12) and likely has been for a long time: barnyardgrass is recognizable in Chinese drawings from 1590 (13).
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Larry W. Mitich (1990) studied this question.
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