Campsis grandiflora is a climbing vine belonging to the family Bignonaceae and genus Campsis. Its Latin scientific name is Campsis grandiflora. It is distributed in central China. It likes a warm, humid and sunny environment and is slightly shade-tolerant.

It grows upwards by climbing on aerial roots. It has pinnately compound leaves with oval leaflets and serrated edges. The flowers are bright red, the corolla is funnel-shaped, and it bears capsules. It likes well-drained soil and is more tolerant of water and humidity. It has certain salt-alkali tolerance.

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

Ling Xiao has been recorded in the "Book of Songs" as early as the Spring and Autumn Period. At that time, people called it Lingxiao. The name of Lingxiao flower first appeared in "Tang Materia Medica". The book said under the heading "Ziwei": "This is Lingxiao flower, and its stems and leaves are used.