What’s the difference between London Rocket and Wild Mustard?



How can I tell the difference between two weeds in Australia, London Rocket (Sisymbrium irio) and Wild Mustard (Sisymbrium orientale)? They both look very similar.

Wild Mustard is also known as Indian hedge mustard or Hedge mustard.

Any help is much appreciated! Thanks!!



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One comment a “What’s the difference between London Rocket and Wild Mustard?”

Differences:

Sisymbrium irio
branched below and above, glabrous or sparsely pubescent at least basally.
basal leaves not rosulate
petiole (0.5-) 1-4.5(-6) cm
leaf blade oblanceolate or oblong in outline
lateral lobes smaller than terminal one
uppermost cauline leaves smaller than basal, entire or 1-3-lobed
fruiting pedicels divaricate or ascending, stout and nearly as thick as fruit
petals yellow, oblong-oblanceolate
Fl. May-Aug, fr. Jun-Sep.

Sisymbrium orientale
branched above, sparsely to densely soft pubescent at least near base , usually glabrous above
basal leaves rosulate
leaf blade broadly oblanceolate to oblong-oblanceolate in outline
petiole (1-) 2-5(-9) cm
lateral lobes much smaller than terminal one
terminal lobe lanceolate or deltoid, often hastate, 1 or 2 lateral lobes
uppermost cauline leaves with narrowly lanceolate or linear
fruiting pedicels ascending to subdivaricate, slender, much narrower than fruit
petals pale yellow, spatulate
Fl. Apr-Jul, fr. May-Aug.

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