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→Classification
== Classification ==
*subsp. ''lenticularis'' (Dougl.) Cockerell (1914) is the wild form from western North America. It is many branches with small heads.
*subsp. ''annuus '' var. ''annuus '' is a weedy form from eastern North America.*subsp. ''annuus '' var. ''macrocarpus '' (DC). Cockerell (1914) includes cultivated forms, which have only one stem and a terminal big head.
== Cultivars ==
