Kangkong or water spinach originated from tropical Asia, most likely India. It is grown for local market s and even exported to Hongkong and Europe. Seed production is a lucrative business in China, Taiwan, Thailand, Hongkong, Japan, and the Philippines. Kangkong is rich in iron and has been reported to have an insulin-like properties which alleviates hyperglycemia
Sources:
http://pdf.usaid.gov/pdf_docs/PDACO117.pdf
http://b-and-t-world-seeds.com (for the photo below)
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