An introduced weed native to the tropical Africa and Madagascar. According to the Flora of Ceylon Vol 5 it was only known from a place between Pussellawa and Ramboda at mile 28/10 along Kandy -Nuwaraeliya Rd (950 m a.s.l. ) in the Nuwaraeliya district. It is also noted that apparently it was a rather recent introduction. Since then (1985) it seems that it has become a widely distributed weed in paddy fields, marshes and roadsides, at least in the moist areas from lowland to the hill country (Personal observations).
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