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Andrographis paniculata is distributed in
tropical Asian countries often in isolated patches. It can be found in a
variety of habitats viz. plains, hill slopes, waste lands, farms, dry or wet
lands, sea shore and even road sides. Native populations of A. paniculata
are spread throughout south India and Sri Lanka which perhaps represent the
centre of origin and diversity of the species [1,2]. The herb is also
available in northern stations of India, Malaysia, Thailand, Brunei,
Indonesia, Hong Kong, West Indies and elsewhere in Americas where it is
probably introduced [1,3,4,5]. Even though the species is distributed over a
broad ecogeographical range, the so called native populations occur only
in south India and Sri Lanka.
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Andrographis photos 
References
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Hooker JD (1885) The flora of British India. L
Reeve & Co, London, 501 p.
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Bhat VS, Nanavati DD (1978) Andrographis
paniculata (Burm) Wall ex Nees. Indian Drugs 15: 187-190.
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Ridley HN (1967) The flora of the Malay
Peninsula. L. Reeve & Co, London, 582 p.
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Backer CA, Bakhuizen van den Brink Jr RC (1967)
Flora of Java. Bishen Sing Mahendra pal Sing, Dehra Dun, 574 p.
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Correll DS, Correll HB (1982) Flora of the
Bahama Archipelago. J. Cramer, Vaduz, 1340 p.
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