This ornamental non-native species originates from South Africa and is one of those famous horticultural plants known as the Ochna, or more imaginatively, the Mickey Mouse Plant. This latter appellation arose as a result of the red calyx resembling the ears of mickey mouse. I must concede that the association seems a bit contrived, but it has stuck!
The leaves of this shrub are small (~5cm or less) and have a saw-like margin, hence the specific epithet ‘serrulata‘. There is no way therefore to mistake this plant for the Native Ochna (Brackenridgea australiana) which has much larger leaves without the teeth, and different venation. Ochna lives up to its ornamental nature when in flower. The flowers are yellow and quite showy when plants are in bloom, but of course, this is a plant for which by their fruits shalt ye know them!
Leaf undersurface
Leaf Whispering in the Tropics 