|Crocus korolkowii 'Snow Leopard' at Wisley|
The plant is Crocus korolkowii 'Snow Leopard', an effectively white-flowered version of this usually yellow species from Central Asia. It's not an albino, as it has all the dark pigment expected, but there's no trace of yellow. The dark speckles on the pale background have what my mother accurately described as a cod-skin effect, while the dark throat shows it is not a form of the the related C. alatavicus, which has a yellow throat. My interest comes from having raised it myself: seed from ordinary 'trade' C. korolkowii was sown in 1985, and this clone first flowered in 1989. Unfortunately it is not very vigorous so it's only grown by a few keen croconuts - I have lost it completely, so it was lovely to see it again, apparently happy and healthy at Wisley.