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The Barnyard grass (Echinochloa crus-galli) belongs to Poaceae (the Grass family). It is an annual herb that is widely distributed throughout Japan, as well as in Taiwan, the Korean Peninsula, China, and tropical to warm-temperate regions around the world. This herb grows on roadsides, in grasslands and fields, and it can reach 80-120 cm in height. The stems are clumpling, and basal sheathes are tinged reddish. The leaves are linear and euralia-like textured. The spikes are borne atop of stems and bear pale green, dense spikeles from August to October. The lemma typically has not arista. It is a C4 plant (Plants with C4-type photosynthesis). In Taiwanese Chinese, it is called "•B", and "•B" (bai) in Chinese.
In Korean, it's called "dol-pi" (돌피). This is a compound word consisting of "dol" (돌) + "barnyard millet" (피). "dol" is a prefix meaning "wild" or "poor quality".
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