Lepidium didymum is an annual or biennial herb with decumbent or ascending and glabrous green stems, up to 40 centimetres (16 in) long, radiating from a central position. The leaves are pinnate and alternate, and can reach a length of 5 cm (2 in). It blooms between July and September. The flowers are inconspicuous, the four white petals very short or absent, with 2 (rarely 4),:54 stamens and the fruits consist of two rounded valves, notched at the apex, with a very short style between.:405 They are also wrinkled and contain orange or reddish brown seeds, that are 1–5 mm long.
Lepidium didymum is of uncertain origin, but is often cited as native to South America, mainly Argentina, Bolivia, Brazil, Chile, Paraguay, Peru, Uruguay and Venezuela. It has been introduced elsewhere as a weed of cultivation. It has naturalised across the globe, from Africa, Europe, Asia, Australasia, North America and South America. In Britain it had been recorded from the wild by 1778, chiefly in England and the south of Ireland, growing on cultivated and waste ground, in gardens and lawns, by paths and roadsides.
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- "Coronopus didymus". The Plant List. Retrieved 2016-07-15.
- "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
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- Gaby H. Schmelzer, Gabriella Harriet Schmelzer and Ameenah Gurib-Fakim (Editors) Medicinal Plants, Volume 1, p. 362, at Google Books
- "Brassicaceae Lepidium didymum L". ipni.org. Retrieved 6 December 2017.
- "Botanary: didymum". davesgarden.com. Retrieved 6 December 2017.
- "Taxon: Lepidium didymum L". npgsweb.ars-grin.gov. Retrieved 6 December 2017.
- "BSBI Distribution maps:Lepidium didymum". London, U.K.: Botanical Society of Britain and Ireland. Retrieved 15 July 2016.
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