Celandine in mixed woodland
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Is unrelated, and has only four petals, whereas this species has at least 5, usually more. It also tends to flower later in the year.
For absolute proof, break the stem: greater celandine has a fluorescent yellow-orange sap.
Just been reading about it and it's flowers stay open even if the sun is not out unlike Lessser C and Wordworth wrote a poem about it.Your right about it being unrelated too
but I'm not well-versed (no pun intended) in poetry.
It turns out he wrote three! Including -
"The Small Celandine
There is a Flower, the Lesser Celandine,
That shrinks, like many more, from cold and rain;
And, at the first moment that the sun may shine,
Bright as the sun itself, 'tis out again!"
Lat/Lng: 51.9724, -3.9045
OS grid ref: SN692321