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Catharanthus roseus
Pink flowers with five petals, a dark red star in the middle of the flower. Waxy green leaves.
Urban.
Native to Madagascar, this plant has been the subject of medical research as of late: http://ntbg.org/plants/plant_details.php....
It looks like the classification has changed a bit from Vinca, but Vinca rosea is a recognized synonym. Thanks Isabela!