Pam Burrow's picture

Marsh Yellow-cress

Observed: 2nd July 2013 By: Pam Burrow
S159 Neighbourhood Nature - course complete
Pam Burrow’s reputation in PlantsPam Burrow’s reputation in PlantsPam Burrow’s reputation in PlantsPam Burrow’s reputation in PlantsPam Burrow’s reputation in Plants
Marsh Yellow-cress 1
Marsh Yellow-cress 2
Description:
Identifications
Species interactions

No interactions present.

Comments

lavateraguy's picture

In Rorippa palustris ...

... the petals and sepals are roughly the same length; in Rorippa sylvestris the petals are about twice the length of the sepals.

There are also Rorippa islandica and several hybrids. You can probably ignore them as being absent from your area.

Pam Burrow's picture

Thanks for your helpful

Thanks for your helpful comments. One of the reasons I was wary of plumping for this id is that in my reference book, it says it's common 'throughout, except in the north'! Ah well...
Pam

Pam Burrow's picture

Thanks for your helpful

Thanks for your helpful comments. One of the reasons I was wary of plumping for this id is that in my reference book, it says it's common 'throughout, except in the north'! Ah well...
Pam

lavateraguy's picture

I hadn't given thought to its distribution ...

... it not being a rare or local plant.

It turns out that in this case the north is north of the Highland Boundary Fault.

You (and I) are in the centre of its distribution - a triangle with one corner at Birmingham stretching north to cover south Lancaster and south west Yorkshire. It's thin on the ground between there and the Scottish Central Lowlands, but that may be due to a lack of observers, rather than any actual scarcity - there is dense cover of old records for the Fylde and Lancaster area, Furness and south Westmorland, and the Vale of Eden, which look as if they are due to old surveys for (vice-)county Floras.

I've found a couple of likely occurrences (I've still to have a good look at the photographs) in the last couple of days, one in a ridiculous habitat - dry ground outside the walls of a public library.

Pam Burrow's picture

Thanks so much. I always find

Thanks so much. I always find your comments helpful and interesting. Makes me realise how little I know!
Pam