Strong Back Root, Jamaican Viagra (Morinda Royoc) The common names are Duppy poison, Goat corn,Yellowroot, Cheese shrub, Morinda royoc, Red gal, Mouses pineapple, Yellow ginger,  and Yaw weed. In Jamaica the root and fruit of the plant strong back (Morinda Royoc) are boil with other herbs such as Black Wiss, Chaney Root,