This is the pure yellow form of the species, less popular than the red-vein variety, but still found widely in gardens. In Latin America these are likened to Japanese lanterns--Farolito Japonese.
This is the Redvein form of the species, which is native to southern Brazil and adjacent countries. Now widespread in gardens, here in Chile. In context at www.dixpix.ca/Amazon/flora/malves/index.html