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Hartwrightia
''Hartwrightia'' is a genus of North American flowering plants in the tribe Eupatorieae of the sunflower family.〔D.J.N.Hind & H.E.Robinson. 2007. Tribe Eupatorieae In: ''The Families and Genera of Vascular Plants'' vol.VIII. (Joachim W.Kadereit & Charles Jeffrey, volume editors. Klaus Kubitzky, general editor). Springer-Verlag. Berlin, Heidelberg.〕 The genus contains a single species, ''Hartwrightia floridana'', native to the US States of Georgia and Florida.〔Holzinger, J. M. 1893. The systematic position of ''Hartwrightia floridana''. Bulletin of the Torrey Botanical Club 20: 287–288.〕〔(Biota of North America Program 2013 county distribution map )〕 The species is sometimes referred to by the common name Florida hartwrightia.
Although superficially similar to some species in ''Eupatorium'', it can be distinguished by having a basal rosette of leaves, flowers of a different shape, and the fruit which lacks the parachute-like pappus found in ''Eupatorium''.〔 The plant is about one meter tall. It flowers in the fall and the flowers are white to pink or blue.〔(【引用サイトリンク】 work = Flora of North America )〕
The genus is named for plant collector Samuel Hart Wright, 1825–1905.〔
== Taxonomy ==
''Hartwrightia'' is classified in the subtribe Liatrinae of the tribe Eupatorieae, along with, for example, ''Liatris'', ''Carphephorus'', and ''Garberia''. Molecular data, while placing ''Hartwrightia'' firmly within subtribe Liatrinae, give mixed results regarding its closest relative. The nuclear ITS/ETS regions place it firmly with ''Trilisa'', with which it shares multiple synapomorphies but also differs at multiple sites. In contrast, it is almost an exact match in the plastid DNA sequences with ''Carphephorus corymbosus''. These results suggest that ''Hartwrightia'' may be of hybrid origin but is transgressive from either putative parental lineage for multiple morphological characters 〔Schilling, E. E. 2011. Hybrid genera in Liatrinae (Asteraceae: Eupatorieae). Molecular Phylogenetics and Evolution 59: 158-167.〕
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