Claim: Knowltonia vesicatoria (of the Ranunculaceae a.k.a. buttercup or crowfoot family) is one of at least ten species of Knowltonia that are native to South America, which can be differentiated from the other species by looking at its leaves and stems being hairless and slightly jagged, toothed margins of the leaves.
Evidence: This is one of at least ten species of Knowltonia that are native to South Africa.