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Northern Yellow-cress?? Northern Yellow-cress??

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Old 13-09-2009, 06:20 PM
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Northern Yellow-cress??
This crucifer, a weed along Bristol's Waterfront, is supposed to be Northern Yellow-cress (Rorippa islandica) - but I'm really not convinced.

What do people think?

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Old 13-09-2009, 06:36 PM
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Re: Northern Yellow-cress??
The leaves look more like R. palustris.
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Old 14-09-2009, 07:18 PM
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Re: Northern Yellow-cress??
The photos seem to match the images I've found online for Rorippa islandica, but unfortunately it looks as if there's a lot of confusion between that and R. palustris when it comes to naming. So I'm not really any further forward

What I really need is someone who's familiar with the species - help
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Old 15-09-2009, 11:24 AM
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Re: Northern Yellow-cress??
The relative lengths of the petals and sepals are important. R. palustris are equal. Hope this helps.
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