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Two new species of Commelinaceae are described from the Neotropics.Dichorisandra amabilis J. R. Grant, widespread from southern Mexico to Panama, consists of erect herbs formerly included in D. hexandra (Aublet) Standley, which is here restricted to scandent plants.Tradescantia petricola J. R. Grant, disjunct from Costa Rica to Venezuela, belongs to Tradescantia sect.Mandonia D. R. Hunt.
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Jason R. Grant (2000) studied this question.
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