Myriam Vandenberghe, as far as I can see, this is Tabernaemontana crassa, from Africa. This species was eventually treated in other genera (e.g., Conopharyngia) which were now considered in Tabernaemontana s.l. In case of doubt with the Apocynaceae basal grade (Rauvolfioideae and Apocynoideae), you may ask Francisco Morales or André Simões who are especialists in these groups. I know the ascleps better. Hope this can help you somehow. All the best, Alessandro
