I thought this plant was in the Oxalis family, but cannot find any ID anywhere. Perhaps someone can steer me in the right direction. Thanks.

I think it might be Oxalis vulcanicola Burgundy

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Definitely Oxalis and a beauty at that!

Thank you, Jolana, greene and plantladylin,
It seems as if the names Oxalis vulcanicola Burgundy and Oxalis vulcanicola Zinfandel are interchangeable, and at ATP the plant is listed as Volcanic Sorrel (Oxalis spiralis subsp. vulcanicola 'Zinfandel') , Plant ID#168015, and that's what I'll go with. You've steered me in the right direction. Thanks again.