Colchicum identification

[biodiversite]

Hello everybody !
I had the surprise to discover this week-end a colchicum flower in a seedling pot forgotten for years. But the label has disappeared for years too ! Any idea ? thanks.

[fermi de Sousa]

I've also got a "mystery colchicum" so I hope you don't mind me adding to your post.
This autumn flowering species originally came as seed of a large flowered species, possibly C. bivonae or C. sibthorpii.
It reproduces readily from seed!
cheers
fermi