adj.of or relating to tropical plants of the family Apocynaceae
英汉双解大词典
apocynaceous/əˌpɒsɪˈneɪʃəs/
1.
ADJ（形容词）
of, relating to, or belonging to the Apocynaceae, a family of mostly tropical flowering plants with latex in their stems, including the dogbane, periwinkle, oleander, and some lianas 夹竹桃科的