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There are about 144 accepted species of Haworthia listed in the Plant List site [1] produced in collaboration between the Royal Botanic Gardens, Kew and Missouri Botanical Garden. However, the actual number and identification of the species is not established; there are over forty species listed as "unresolved" for lack of sufficient information, and the full list reflects the difficulties of Haworthia taxonomy; it includes varieties and synonyms to a total of 966, even though it excludes various garden hybrids and cultivars.[3] The following list includes only the fully accepted species in the Plant List.
http://en.wikipedia.org/wiki/Haworthia
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