Campsis grandiflora is a climbing vine of Osmundaceae, which is distributed in the central part of China. It likes warm and humid sunny environment and is slightly shade-tolerant.

It takes root by air to climb other things to grow upwards, with pinnate compound leaves, oval leaflets, serrated edges, bright red flowers, funnel-shaped corollas and capsules. It likes well-drained soil, is more resistant to water and humidity, and has certain saline-alkali tolerance.

It has medicinal value, the effects of promoting blood circulation, removing blood stasis, cooling blood and expelling wind, and also has ornamental value.

Ling Xiao was recorded in the Book of Songs in the Spring and Autumn Period. At that time, people called it Ling Heng, and "it's beautiful, but it's expensive" means Ling Xiao. The name of Camptotheca grandiflora first appeared in Tang Materia Medica, which said under the heading of "Osmunda japonica": "This is Camptotheca grandiflora, which is also used for stems and leaves.