The Tucker Greenhouse has a small collection of Hoyas, or Wax plants.  These plants are found in the Apocynaceae family.  There are three different species shown below.  Note the similarities of each inflorescence.  The Hoya collection is located in the main hallway inside of the Tucker Greenhouse.

Hoya cumingiana or Bush Hoya

Hoya kentiana or Porcelain flower

Hoya carnosa or Wax plant