Uncaria rhynchophylla (miq.) miq. ex havil.), also known as Uncaria rhynchophylla, Rattan, Clerodendrum aquilinum, upside-down thorn, etc. It is an evergreen vine belonging to Uncaria of Rubiaceae, a climbing shrub with slender and hairless square stems and branches, oval leaves and flower heads.

Uncaria rhynchophylla is used as medicine with hooked stems and branches, which has the effects of clearing away heat, calming the liver, calming the wind and arresting convulsion. Modern pharmacological experiments have also proved that Uncaria rhynchophylla has antihypertensive effect, so it has high medicinal value.

as shown in figure