The paleotropic genus Exacum (Gentianaceae: Exaceae) is revised for
South India, recognizing twelve species and one variety. E. wightianum var.
uniflorum is synonymized under E. klackenbergii while E. grande is reduced to
the variety of E. tetragonum. Nine out of thirteen taxa (75%) are endemic to
the southern Western Ghats while one is critically endangered (E.
travancoricum), one endangered (E. tetragonum), one vulnerable (E. courtallense)
and six are rare (E. anamallayanum, E. atropurpureum, E. klackenbergii, E.
lawii, E. tetragonum var. grande and E. wightianum). The problems in the
typification of E. courtallense var. laxiflorum are dicussed. Detailed
taxonomic descriptions, photoplates and a key to the identification of species
in South India are provided. - See more at:
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