EASTERN ROCKET

Sisymbrium orientale

Cabbage Family [Brassicaceae]

month8apr month8april month8may month8jun month8june month8jul month8july month8aug month8sep month8sept month8oct month8nov month8dec

status
statusZneophyte
flower
flower8yellow
morph
morph8actino
petals
petalsZ4
stem
stem8round

5th July 2014, Rimrose Valley Park, Waterloo, Sefton Coast. Photo: © RWD
Erect or sprawling.


5th July 2014, Rimrose Valley Park, Waterloo, Sefton Coast. Photo: © RWD
This specimen has a preponderance of very-long lanceolate leaves, but leaf shape can apparently vary quite a lot. Grows up to 1m high.


19th May 2018, a construction site, Chesterfield. Photo: © RWD
The shadows of the plant on the lime-green wall somewhat confuse the photo. This specimen is branched.


19th May 2018, a construction site, Chesterfield. Photo: © RWD
Arrow-head Y-shaped leaves are also a common feature of the middle parts of Eastern Rocket (slightly right of dead-centre).


28th May 2012, Rhos Point, Colwyn Bay, North Wales coast. Photo: © RWD
Whereas this specimen has few narrow Y-shaped leaves but a few more irregular-leaflet pinnate leaves.


19th May 2018, a construction site, Chesterfield. Photo: © RWD
But the most striking feature when fruiting are the very long seed-pods, which are between 2.5 to 12cm, nearly straight, and angled upwards. You can look at either the shadows or the plant itself, both tell the story. There's a short pinnate leaf near the bottom shaped like a fish with tail-fins. [The green leaves emerging from the ground are probably of another plant].


5th Aug 2017, roadside, Hall Road, Sefton Coast. Photo: © RWD
Ripe and very long seed pods.


5th Aug 2017, roadside, Hall Road, Sefton Coast. Photo: © RWD
Ripe seed pods seem to be square with ribs here and emerge from a short stalk once the flower stalk (pedicel). The pedicels are about 1mm wide and >2/3ds as wide as the ripened fruits.


28th May 2012, Rhos Point, Colwyn Bay, North Wales coast. Photo: © RWD
Seed pods growing from the flower at top whilst those lower down are longer and have discarded their now redundant flowers. Two long linear leaves/bracts emerge from just beneath a flowering branch (nearer the bottom of the photo).


28th May 2012, Rhos Point, Colwyn Bay, North Wales coast. Photo: © RWD
The petals, at longer than 6mm, are much longer than the sepals (which form a tube at the base). The styles are growing longer and into seed pods.


28th May 2012, Rhos Point, Colwyn Bay, North Wales coast. Photo: © RWD
The four greeny-yellow sepals form a loose tube around the lower part of the flower.


5th July 2014, Rimrose Valley Park, Waterloo, Sefton Coast. Photo: © RWD
Several as-yet un-opened flower buds at the summit. Others lower down opened first and are now decaying and the style elongating to become seed pods.


5th July 2014, Rimrose Valley Park, Waterloo, Sefton Coast. Photo: © RWD
The seed pods are hairy at first but become glabrous later. The green sepals appear much hairier.


28th May 2012, Rhos Point, Colwyn Bay, North Wales coast. Photo: © RWD
The 6 anthers are long and curved over somewhat. In the centre a style with discoidal stigma, shorter than the anthers but to become much longer seed pods.


28th May 2012, Rhos Point, Colwyn Bay, North Wales coast. Photo: © RWD
As-yet unopened flower pods.


28th May 2012, Rhos Point, Colwyn Bay, North Wales coast. Photo: © RWD


28th May 2012, Rhos Point, Colwyn Bay, North Wales coast. Photo: © RWD
Long linear leafy bracts just below a flowering branch. Growing seed pods above.


28th May 2012, Rhos Point, Colwyn Bay, North Wales coast. Photo: © RWD
Lower leaves can appear pinnate, but they are not in opposite pairs.


28th May 2012, Rhos Point, Colwyn Bay, North Wales coast. Photo: © RWD
The whole plant! Keep scrolling, or turn your computer monitor into portrait orientation. The upper leaves only have between 2 and no side-lobes (the lower leaves wider and more side-lobes and often with a slightly larger terminal lobe).


Not to be semantically confused with : Eastern Larkspur (Consolida hispanica), Eastern Cyclamen (Cyclamen coum), Eastern Leopard's-bane (Doronicum columnae), Eastern Pellitory-of-the-wall (Parietaria officinalis), Eastern Groundsel (Senecio vernalis) or the tree Eastern Hemlock (Tsuga canadensis) [plants with similar names belonging to differing families].

There are several differing genera containing so-called 'Rockets': this one is in the Sisymbrium genus, other 'Rockets' are in Diplotaxis and Cakile which contains just Sea Rocket

It is a neophyte which is frequently naturalised in waste places, like building sites, roadsides, etc.


  Sisymbrium orientale  ⇐ Global Aspect ⇒ Brassicaceae  

Distribution
 family8Cabbage family8Brassicaceae

 BSBI maps
genus8Sisymbrium
Sisymbrium
(Rockets)

EASTERN ROCKET

Sisymbrium orientale

Cabbage Family [Brassicaceae]