What is the hybrid name for Tree Ivy?

The hybrid name for Tree Ivy is indeed x Fatshedera lizei. This plant is a result of crossing the genus Fatsia, which consists of broad-leaved evergreen plants, with the genus Hedera, commonly known as ivy. The combination produces a robust, climbing plant that features the distinctive characteristics of both parents, thriving in a variety of environments, especially in milder climates.

The other options listed represent different plant species altogether. Camellia sasanqua is a species of flowering plant in the family Theaceae, known for its beautiful blossoms. Cephalotaxus harringtonia, commonly known as the Japanese plum yew, is a coniferous shrub or tree. Clethra alnifolia, or summersweet, is a flowering shrub known for its fragrant blooms and is unrelated to ivy or its hybrids. Each of these plants serves different ornamental and ecological roles, but none are connected to the hybrid designation of Tree Ivy.