Glebionis segetum (syn. Chrysanthemum segetum) is a species of the genus Glebionis, probably native only to the eastern Mediterranean region but now naturalized in western and northern Europe as well as China and parts of North America.<ref>Altgervista Flora Italiana, Glebionis segetum (L.) Fourr. includes photos and European distribution map</ref><ref>Biota of North America Program 2014 county distribution map</ref><ref>Flora of China, Glebionis segetum (Linnaeus) Fourreau, 1869. 南茼蒿 nan tong hao </ref> Common names include corn marigold and corn daisy.
Glebionis segetum is a herbaceous perennial plant growing to 80 cm tall, with spirally arranged, deeply lobed leaves 5–20 cm long. The flowers are bright yellow, produced in capitula (flowerheads) 3.5-5.5 cm in diameter, with a ring of ray florets and a centre of disc florets.<ref>Flora of North America, Glebionis segetum (Linnaeus) Fourreau, 1869. Corn marigold </ref>
Glebionis segetum was formerly treated in the genus Chrysanthemum, but under a 1999 decision of the International Botanical Congress, that genus has been redefined with a different circumscription to include the economically important florist's chrysanthemum (now Chrysanthemum indicum).
The corn marigold appears to have been a serious weed during the 13th century in Scotland, as suggested by a law of Alexander II which states that if a farmer allows so much as a single plant to produce seed in amongst his crops, then he will be fined a sheep.<ref name="Dalrymple338">Dalrymple, Sir David (1776). Annals of Scotland. Pub. J. Murray. London. P. 338 -339.</ref>
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