Growing close to river bank on very sandy substrate
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I have zoomed in on the leaves I wonder if it is Marsh Yellow cress which grows in damp marshy area's and sometimes in water scientific name Rorippa palustris,but I to find Cabbage (Brassicaceae) family hard to separate,hope this help's and I have not just added to the confusion.
I would be quite prepared to say that a fossilized railway would be well drained as it was once built for profit that relies on it not flooding.
It is unlikely to be a damp spot.
All suggestions greatly appreciated. I haven't a clue! Must say, though, I've never heard of Marsh Yellow Cress. Will look it up - it must be in one of my books!
As for Refugee's idea - there is, indeed a fair amount of Oil-seed Rape grown locally. But in my experience, it is always much taller than the plant in the photo (and, to be honest, I've never really looked closely at the leaves.)
Few of us would even try looking at the leaves with the bright yellow flowers as a serious distraction.
You just have to crawl on all fours to the edge of the crop or get blinded!!!
I think you've got a wee bit confused there Simon about which OBS you were contributing to. My reference to the dry conditions was in ref. to the Geum. This plant (still unresolved, I think is certainly not in a dry place - being no more than 5-6 feet from the river bank and considerably less than that above it!
Re Oilseed Rape - next time I see it, I'll try your suggestion!
I some how looked at two you put up and got my lines crossed. It still looks like the footing of a foot path that is raised far enough above the water to be non marshy.
Lat/Lng: 55.59991, -2.42359
OS grid ref: NT734341