Which plant is known as Paperbush or Edgeworthia?

The plant commonly known as Paperbush or Edgeworthia is indeed Edgeworthia chrysantha. This plant is a deciduous shrub native to eastern Asia, particularly China and Japan, and is well-known for its fragrant yellow flowers that appear in late winter to early spring. The name "Paperbush" derives from the traditional use of its stems to produce paper, highlighting its cultural significance in certain regions.

Edgeworthia chrysantha has distinctive, arching stems and large, leathery leaves, which contribute to its ornamental appeal in gardens. Its flowers are arranged in dense clusters, and as they bloom, they emit a pleasant fragrance, attracting pollinators like bees during a time when few other plants are flowering.

Knowing this, it becomes clear why Edgeworthia chrysantha is the correct answer—it is the specific plant recognized by those common names, while the other options refer to different species with different characteristics and uses.