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== 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 ==
*Cultivars used for their seeds eaten as snacks have usually big heads and big akenes striped with brown and white.
*Cultivars grown for the extraction of oil have small heads and small black akenes.
**Usual oil sunflower cultivars give an oil with 24% oleic acid and 65% linoleic acid.
**High oleic cultivars give an oil with 50% to 90% oleic acid. They must be grown in isolation from
== History ==
