There is an interesting controversy on P. niruri in India and this has the potential to start a great debate. Currently i would like to annotate some research articles here which are found by @Lakshmy
Germinating potential of Phyllanthus amarus seeds: evaluation of biochemical parameters | SpringerLink Though the medicinal plant has been distinguished according to the morphological features by the taxonomist, the species P. amarus is often mistaken for other closely related species such as Phyllanthus niruri , Phyllanthus debilis , Phyllanthus maderaspatensis and Phyllanthus virgatus
Systematic Studies in Herbaceous Phyllanthus Spp. (Region: Tiruchirappalli District in India) and a Simple Key to Authenticate ‘Bhumyamalaki’ Complex Members - CORE
P. niruri L. is a native of New World and endemic to America and does not occur in India, although there are many publications in India claiming work on P. niruri L. Those reports are actually pertaining to investigations in Ã¢â‚¬Ëœniruri complexÃ¢â‚¬â„¢ but not on P. niruri L.
The study reveals that 'Phyllanthus nirui in Fora of British India is a mixture of three distinct species, viz., P. amarus Schum. & Thonn., P. fraternus Webster and P. debilis Klein ex Willd., the true P. niruri Linn, being endemic to West Indies. It is further observed that true P. debilis Klein ex Willd. (1804) is not correctly recognised in any Indian Flora and the plant that goes under the name is an altogether different species-P. debilis Herb. Ham. ex Hook.f. (1887), which however, being a later homonym is to be replaced by P. aity-shawii Brunei & Roux (1984).