Index Kewensis
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The Index Kewensis (IK) is maintained by the Royal Botanic Gardens, Kew: its aim was to register all formal botanical names for seed plants, at the rank of species and genus. Later, it also started to include names of families and of taxa below the rank of species.
It was started in 1885, with regular supplements issued on newly published names. A digitalized version of the IK has been integrated in IPNI, so that it can be consulted online: its entries are recognizable by the letters "(IK)".