Lepidium didymum

Lepidium didymum, synonym Coronopus didymus,[2] the lesser swine-cress,[3] is a species of flowering plant in the family Brassicaceae.

Lepidium didymum
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Brassicales
Family: Brassicaceae
Genus: Lepidium
Species:
L. didymum
Binomial name
Lepidium didymum

Description

Lepidium didymum is an annual or biennial herb[4] 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),[5]:54 stamens and the fruits consist of two rounded valves, notched at the apex, with a very short style between.[6]:405[7] They are also wrinkled and contain orange or reddish brown seeds, that are 1–5 mm long.[7]

Taxonomy

It was first described and published by the Swedish botanist Carl Linnaeus in 'Mant. Pl.' (Mantissa Plantarum) on page 92 in 1767.[8][1]

The specific epithet didymum, refers to the Latin term for 'twin' or 'in pairs',[9] referring to the seed capsule.

Distribution

Lepidium didymum is of uncertain origin,[4] but is often cited as native to South America,[6][5] mainly Argentina, Bolivia, Brazil, Chile, Paraguay, Peru, Uruguay and Venezuela.[10] 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.[10] In Britain it had been recorded from the wild by 1778,[4] chiefly in England and the south of Ireland,[11] growing on cultivated and waste ground, in gardens and lawns, by paths and roadsides.

gollark: Yes, I've heard distances are much more significant there but never actually experienced it.
gollark: 8 miles of walking is still... an hour or so, no?
gollark: But having to travel half an hour to get to the city where anything interesting happens is annoying.
gollark: The UK apparently has anomalously high population density so [RURAL AREA REDACTED] isn't very isolated compared to US rural areas, given that you can feasibly drive across England in 10 hours or so.
gollark: Personally, I do not actually have ”guns” and I use headphones for music.

References
  1. "Lepidium didymum". The Plant List. Retrieved 2016-07-15.
  2. "Coronopus didymus". The Plant List. Retrieved 2016-07-15.
  3. "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
  4. "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.
  5. Clapham, A.R.; Tutin, T.G.; Warburg, E.F. (1981). Excursion Flora of the British Isles (Third ed.). Cambridge University Press. ISBN 0521232902.
  6. Stace, C. A. (2010). New Flora of the British Isles (Third ed.). Cambridge, U.K.: Cambridge University Press. ISBN 9780521707725.
  7. Gaby H. Schmelzer, Gabriella Harriet Schmelzer and Ameenah Gurib-Fakim (Editors) Medicinal Plants, Volume 1, p. 362, at Google Books
  8. "Brassicaceae Lepidium didymum L." ipni.org. Retrieved 6 December 2017.
  9. "Botanary: didymum". davesgarden.com. Retrieved 6 December 2017.
  10. "Taxon: Lepidium didymum L." npgsweb.ars-grin.gov. Retrieved 6 December 2017.
  11. "BSBI Distribution maps:Lepidium didymum". London, U.K.: Botanical Society of Britain and Ireland. Retrieved 15 July 2016.
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