Oxalidaceae

The Oxalidaceae, or wood sorrel family, are a small family of five genera of herbaceous plants, shrubs and small trees, with the great majority of the 570 species in the genus "Oxalis" (wood sorrels). Members of this family typically have divided leaves, the leaflets showing "sleep movements", spreading open in light and closing in darkness.
The genus "Averrhoa" of which starfruit is a member, is usually included in this family (e.g. APG IV, 2016), but some botanists place it in a separate family Averrhoaceae.