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That REALLY is something Roma! From the colour of the foliage and the chips, I would guess the colour is pretty true? Is this named for Sandy Leven?
Now, this Oxalis bloom for meOxalis aff. monophyllaLocation: South Africa, DysseldorpOxalis luteolaLocation: South Africa, DoornrivierOxalis spec.Location: South Africa, Bloeberg, Khamiesberge
I don't think your O. luteola IS luteola. I'm sorry that I can't really say more than that as mine is just about died off now but the leaves are bright apple green, slightly dented at the apex and not coloured on the backs. Nor does it have red stems and the leaves and stems are hairless. I haven't a picture of luteola but here is luteola maculata which is only different in having dark reddish patches on the leaves.