Vigna caracalla is a leguminous vine from the family Fabaceae, originating in tropical South America and Central America. The species is named caracalla, a corruption of the Portuguese caracol, meaning snail. This perennial vine has fragrant flowers said to be reminiscent of hyacinths - with a distinctive curled shape, giving rise to the common names corkscrew vine, snail vine, snail creeper, or snail bean.
There are two species sold and cultivated under this name. One is the true Vigna caracalla. The other appears to be Vigna speciosa or a close relative.
This vine is hardy in zones 9 and above, liking full sun and consistently damp soil. It prefers high heat and humidity and can become invasive if these conditions are met. In colder zones, it does well in a pot if it is overwintered inside.
Some data indicates some edible properties to this plant - specifically the flowers - but this should be verified from a reputable source before attempting.