抄録
In this paper the classification of the wild Japanese barnyrd millet (Echinochloa crus-galli) was described basing mainly on the morphological characters. The most distinguishing characters of the classification are the growth types of the plants, being three, that is, erect-, prostrate-, and intermediate type. The existence of antocyan in coleoptyl, mid-rib and sheath contribute to classify the wild Japanese barnyard millet. The colour of stigma is purple or white. The awn of spikelet forms of panicle and density of spikelet on the lateral axis are also standards of the classification of the plants. We have recognized the wide variations on the number of tillers and the period of shooting. It was especially interested that the individuals of this plant, the forms of which much resembled to the rice plant morphologically and ecologically remained on the lowland rice field and prevaild. The individuals remarkably differ from the rice plant have a tendency to be removed as useless.
