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Published online by Cambridge University Press: 12 June 2017
A year's study of the kinds of weed seeds caught in an 18-mesh copper screen intercepting half the canal width found seeds of 20 species or genera. Bermudagrass (Cynodon dactylon) was found every month of the year; saltgrass (Distichlis spicata) only in March; others in 2 to 10 months of the year.