Common along roadsides on old stone walls within olive groves. I learned this plant as Vinca sardoa. Growing with Oxalis pes-caprae (an Oxalis that is not indigenous to Sardegna)
Local name = Green milkweed. Host plant for the Monarch butterfly
"Hoya carnosa"- @penny_haberman
Observation and photo by @penny_haberman
Apocynaceae is a family of flowering plants that includes trees, shrubs, herbs, stem succulents, and vines, commonly called the dogbane family. Members of the family are native to European, Asian, African, Australian and American tropics or subtropics, with some temperate members.