Hibiscus is a genus of flowering plants in the mallow family, Malvaceae.
The genus is quite large, comprising several hundred species that are native to warm-temperate, subtropical and tropical regions throughout the world.
Member species are renowned for their large, showy flowers and are commonly known simply as hibiscus, or less widely known as rose mallow.
The genus includes both annual and perennial herbaceous plants, as well as woody shrubs and small trees.
The generic name is derived from the Greek word hibískos, which was the name Pedanius Dioscorides (c. 40–90) gave to Althaea officinalis. (source)
So can rabbits eat hibiscus?
Yes they can, they are fine for bunnies to eat.