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). 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 It flowers between July and September.:54
Lepidium didymum is of uncertain origin, but is often cited as native to South America. It has been introduced elsewhere as a weed of cultivation. 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.
- "Lepidium didymum". The Plant List. Retrieved 2016-07-15.
- "Coronopus didymus". The Plant List. Retrieved 2016-07-15.
- "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-02-25. Retrieved 2014-10-17.
- "Online Atlas of the British & Irish flora: Coronopus didymus (Lesser swine cress)". London, U.K.: Biological Records Centre and Botanical Society of Britain and Ireland. Retrieved 15 July 2016.
- Clapham, A.R.; Tutin, T.G.; Warburg, E.F. (1981). Excursion Flora of the British Isles (Third ed.). Cambridge University Press. ISBN 0521232902.
- Stace, C. A. (2010). New Flora of the British Isles (Third ed.). Cambridge, U.K.: Cambridge University Press. ISBN 9780521707725.
- "BSBI Distribution maps:Lepidium didymum". London, U.K.: Botanical Society of Britain and Ireland. Retrieved 15 July 2016.
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