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White flower with purple tongue. Chinese violet, Asystasia gangetica. Poon Saan, Christmas Island, Australia, April 2011.   In Australia, Asystasia gangetica is considered to be a sleeper weed with a threat to agriculture and biodiversity. Asystasia gangetica ssp micrantha is on the Australian Alert List for Environmental Weeds, a list of 28 non-native plants that pose a threat to biodiversity and cause other environmental damage.