Hi there everyone, I think that I can throw some light on this subject. Around five years ago I had a long conversation with Allan Robinson, who used to be in the Alpine Department at RHS Wisley. Both of us were interested in Oxalis and had some doubts over the naming of this well known plant, which had wobbled around over the years. Mike Grant, who was then the botanist in the Wisley Herbarium and is now the Editor of The Plantsman, was brought into the conversation in the hope that he could determine its correct name. I laboriously typed typed out the description in my copy of Salter's monograph and e-mailed it to him. He then confirmed it to be O. melanosticta Sond. Incidentally, the flower colour can vary from bright yellow to cream and I believe the cultivar 'Ken Aslet' to refer to the bright yellow form that is common in cultivation in the UK, though I don't know where it was first published. Best regards, David Victor