First, there are several kinds of vines that can shed red juice after being cut off, all of which are called blood vines, but there is only one kind of blood vine in the true sense, which refers to Schisandra chinensis or the vines of Schisandra chinensis. There are also red vines, usually referring to the rattan stems of red vines. There is also a small blood vine, which is the rattan stem of the iron hoop powder of Magnoliaceae. As for Spatholobus suberectus and Sargassum, they are rattan stems of Leguminosae.

2. 1 Appearance characteristics of Saussurea involucrata: It is divided into two strains, one is Schisandra chinensis and the other is Schisandra chinensis. Schisandra sphenanthera has light green branches, purple-brown branchlets, wide oval leaves and yellow flowers. The whole plant of Schisandra sphenanthera is hairless, the leaves are papery and obovate, the surface is dark green, and the flowers are orange-yellow, which mostly bloom in April-July.

2. Caulis Sargentodoxae: Caulis Sargentodoxae is a vine of Caulis Sargentodoxae, with a length of 10 m and a hairless surface. When the branches were dark red, the leaves were three compound leaves, and the leaflets were leathery and oval. Its flowers are racemes. Male and female flowers usually grow in the same inflorescence, and some grow separately.

3. Caulis Polygoni Avicularis: Caulis Polygoni Avicularis is the stem of the iron hoop powder of Schisandra of Magnoliaceae. Its surface is hairless, its branches are brown, and it has a silvery white cuticle. The leaves are paper and oval. Its flowers are orange-yellow, some are solitary, and some are 2-3. The flowering period is usually in June-August, after which it will bear fruit and the fruit will mature in August-September.

4. Spatholobus suberectus: Spatholobus suberectus is the rattan stem of Melilotus in Leguminosae. Its leaves are revived, the leaflets are paper, and the length is 9- 19 cm. Its flowers are panicles, about 50 cm long, with yellow-brown hairs on the inflorescence axis and white petals, which usually open in June.

5, red blood vine: red blood vine is also a climbing shrub, its branches are purple brown at first, and then turned gray. The leaves are compound and leathery. Its flowers are panicles composed of several flowers, which grow in the axils of leaves and the corolla is purple. It belongs to the same family as Spatholobus suberectus and is also a substitute for the latter.