Corn Mayweed
n. ubiquitous European annual weed with white flowers and finely divided leaves naturalized and sometimes cultivated in eastern North America; sometimes included in genus Matricaria 同义词：scentless camomilescentless false camomilescentless mayweedscentless hayweedTripleurospermum inodorumMatricaria inodorum
European white-flowered weed naturalized in North America 同义词：corn chamomilefield chamomileAnthemis arvensis