Characteristics features of apocynaceae family of rauvolfia plant?

Characteristics of the apocynaceae, or milkweed, family are a milky sap; leaves that are simple, opposite, or whorled; flowers that are large, colorful, and slightly fragrant with five contorted lobes; and fruits at grow in pairs. Rauwolfia is a genus of plants in the Apocynaceae family that contains active plant alkaloids, such as reserpine, some of which have been used as tranquilizers and as antihypertensive agents.