Possible Clues:

• E-mail Cal about the flowering shrub
• Relative of tea producer has the hump with America city over institute
• Evergreen shrub
• Flowering shrub for Mal and Celia
• Japonica
• Flowering shrub for Mal and Celia, oddly
• Alabama's state flower
• Shrub related to tea
• Showy white flower
• Shrub of the tea family