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Range DescriptionThe species is distributed in the pantropics and subtropics including Bangladesh, Bhutan, China (Guangdong, southwest Guangxi (Longzhou Xian, Pingxiang Shi), southwest Guizhou (Anlong Xian, Wangmo Xian), Hainan, southeast Xizang (Mêdog Xian), and southeast Yunnan), Sri Lanka, Nepal, Malaysia, Myanmar, Thailand, Viet Nam, Cambodia, Lao PDR, Korea, Taiwan, New Caledonia, Guyana and South Africa. Te species has been widely introduced and is considered a serious weed in agricultural crops.
In India, it is found at an altitude of up to 1,400 m in the Western Ghats. Widely distributed in Kerala (Thekkady, Periyar Tiger Reserve, Palghat), Andaman and Nicobar Islands, Bihar, Gujarat, Goa, Karnataka (Udupi); Mizoram, Punjab, Sikkim, Tamil Nadu, West Bengal, Maharashtra (Ahmednagar, Akola, Amaravadi, Bombay, Chandrapur, Kolhapur, Nagpur, Nasik, Osmanabad, Pune, Raigad, Ratnagiri, Satara, Sholapur, Sindhudurg, Thane), Madhya Pradesh (Balaghat, Damoh, Dhar, Hoshangabad, Katni, Mandla, Panna, Rajnandgaon, Surguja) and Chattisgarh (Bastar, Bilaspur, Raipur) (Cook 1996, Lakshminarasimhan 1996, Khanna and Ram Saran 2001).