SEA RADISH

Raphanus raphanistrum ssp. maritimus

Cabbage Family [Brassicaceae]

month8may month8jun month8june month8jul month8july month8aug month8sep month8sept month8oct

status
statusZnative
flower
flower8yellow
morph
morph8actino
petals
petalsZ4
stem
stem8round

31st May 2007, Angerton Point, Duddon Estuary, Cumbria. Photo: © RWD
Sprawling about up to a 1.5m in height, always near the sea.


31st May 2007, Angerton Point, Duddon Estuary, Cumbria. Photo: © RWD
The main stem makes an attempt to grow upright, branches horizontal to 70° slightly upwards.


31st May 2007, Angerton Point, Duddon Estuary, Cumbria. Photo: © RWD
Yellow flowers in bunches near the ends of each branch.


31st May 2007, Angerton Point, Duddon Estuary, Cumbria. Photo: © RWD
Leaves pinnate and toothed, twice as long as broad, and clasping the stem with auricles, serrately toothed. Terminal leaflet lobed and toothed.


31st May 2007, Angerton Point, Duddon Estuary, Cumbria. Photo: © RWD
Four deep yellow and long petals narrower near the centre, with four yellower stamens.


31st May 2007, Angerton Point, Duddon Estuary, Cumbria. Photo: © RWD
Petals have faint darker-yellow veins. The long sepal tube has pimples with short hairs at the summit.


31st May 2007, Angerton Point, Duddon Estuary, Cumbria. Photo: © RWD
Flower stems are reddish with scattered pimples, each having a single short backwards-pointing hair. The flower buds are green with the same pimples but forwardly directed short hairs. Sepal tubes and flower buds both have splotches of redness near the base.


27th July 2012, Marshside, Sefton Coast, Lancs. Photo: © RWD
A basal rosette in the first year of the biennial Sea Radish. The lilac flowers of Sea Rocket, another Brassica, are in the left corners.


31st May 2007, Angerton Point, Duddon Estuary, Cumbria. Photo: © RWD
Leaves pinnate, matt, light-green, terminal leaflet toothed and slightly lobed. Lower stems hairy.


31st May 2007, Angerton Point, Duddon Estuary, Cumbria. Photo: © RWD
Higher up, the stem leaves are pinnate, with fewer leaflets, all much narrower, and the terminal leaflet pointedly lobed. Forwardly directed hairs on pimples.


29th June 2014, marina, Southport, Sefton Coast. Photo: © RWD
It is an biennial/perennial. Only the basal rosettes grow in the first year, the rest oif the plant with flowers grows in the next and/or subsequent years. It is space-filling, the leaves are smaller towards the centre and get larger further away so as to maximise the light gathering potential, and also to shade out any competitors.


29th June 2014, marina, Southport, Sefton Coast. Photo: © RWD
Basal rosette.


Not to be confused with : Horseradish (Armoracia rusticana) [a plant with similar name in the same family as differing genus]

Hybridises with :

  • Wild Radish to produce Raphanus raphanistrum subsp. maritimus × subsp. raphanistrum (no common name)
  • Garden Raddish (Raphanus × sativus) in complicated ways.

Some similarities to : Isle of Man Cabbage, which also has four yellow petals, but with Isle of Man Cabbage the petals are much rounder rather than ling and thin. There are no pimples with hairs atop (most likely trichomes). And Isle of Man Cabbage grows to only half the height (60cm), and the pinnate leaves are all lobed and without serrated teeth and are also grey green. Also the seed pods are long and thin on Isle of Man Cabbage, whereas they are conspicuously beaded with spherical lumps on Sea Radish.

Lundy Cabbage, another yellow-flowered member of the Cabbage Family with which it may possibly be confused, is much rarer, only found on Lundy Isle, has flowers of a deeper yellow and is only a short-lived perennial.

Wallflower Cabbage is yellow but taller, but grows mainly in Monmouthshire.

Other yellow Brassicas with which it may be mistaken for from afar: Oil-Seed Rape, Wild Turnip, Wild Cabbage, Black Mustard, Hoary Mustard, Charlock, Hoary Mustard, White Mustard, Bastard Cabbage, Steppe Cabbage, and many many more...

Grows on bare ground near the sea. Garden Radish, with which it may possibly be confused by name, is much shorter, less than a foot in height, and the flowers, never yellow, are usually white or lilac; the pods hardly beaded.


  Raphanus raphanistrum ssp. maritimus  ⇐ Global Aspect ⇒ Brassicaceae  

Distribution
 family8Cabbage family8Brassicaceae

 BSBI maps
genus8Raphanus
Raphanus
(Radishes)

SEA RADISH

Raphanus raphanistrum ssp. maritimus

Cabbage Family [Brassicaceae]

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