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I thought about Watercress, but stems looked a bit hairy.
But not really happy about C. officinalis on closer inspection either. Thought perhaps Bitter-cress.
I see what you mean. Stace says "hairs 0 or unbranched" but Poland says "hairless" for Nasturium.
Curse these cabbages! Lol
I'm never going to get them sorted.
I convinced myself full circle-
Common Scurvy grass - then English, then all forms of Bitter cress, then ruled them all out and started again.
I think I shall hang my head in shame for now wearing my Dunces cap and ask Tim Rich for some tuition! :)
Let's face it, it's hard to ID from photos. Nice to bounce ideas around, though.
It's all very new to me "ID"ing on-line at the moment and I'm really loving seeing what everyone else is stumbling across while they are out and about, and noting what's flowering where.
I'm learning a lot from making my mistakes, so nothing ventured nothing gained I say :)
Think it is watercress maybe Narrow fruited or Hybrid, time and pods will tell.
I have revisited this many times over the past week and thought it is probably Hairy Bitter Cress, but lacked the courage of my convictions!
I WILL get my eye in one day.... Maybe not in this lifetime though! :)
Lat/Lng: 57.213, -6.016
OS grid ref: NG576207