Pentas

Pentas (pentas lanceolata) Hardy Zones 9 - 11. Grows 3' to 4' tall with clusters of flowers that bloom throughout the year. Flowers come in several colors and are excellent for cutting. Good rugged plant the attracts butterflies and hummingbirds. May suffer die back in temperatures below freezing, but usually recovers. Prefers sun to partial shade.

• Dave's Garden
• floridata.com
• HEAR (Hawaiian Ecosystems at Risk)
• University of Florida
• University of Florida
I'd also recommend checking out My Butterfly Garden Plant Diary