Revision of Trillium subgenus Phyllantherum (Liliaceae)

  title={Revision of Trillium subgenus Phyllantherum (Liliaceae)},
  author={John D. Freeman},
A taxonomic revision, based mainly on morphological and distributional criteria, is presented for all taxa ofTrillium subgen.Phyllantherum Raf., which is characterized by sessile flowers. The 22 species recognized as valid include 17 morpho-geographical species in the eastern United States and five in the northwestern United States and California. These species form three morphological alliances that are characterized informally as “species groups.” All the taxa are described, and a key to… 

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