アメリカ合衆国中南部におけるヒエ属植物の自生状況

概要

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記事区分：調査The natural habitats and weedy properties of Echinochloa species were surveyed in the south central U.S.A., in Arkansas, Mississippi, and Louisiana. E. crus-galli and E. colona were most abundant throughout especially in rice fields, and E. muricata var. muricata was found on the banks of ponds or marshy places, in creeks, and sometimes in rice fields. In southeast Louisiana, a perennial E. polystachya var. polystachya was established as one of the most problematic weeds in rice fields where water-seeded cultivation and ratoon crop production of rice have been conducted. This species sets seeds almost scanty, but it is vegetatively propagated by stolons and rhizomes. In coastal region of the Mississippi delta, E. polystachya var. spectabilis，E. crus-pavonis, and E. walteri are crowded together in the shallow water region at the shore of marshes.
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