A New Species and Introgression in Eastern Asian Hemlocks (Pinaceae: Tsuga)

  title={A New Species and Introgression in Eastern Asian Hemlocks (Pinaceae: Tsuga)},
  author={G. Paul Holman and Peter del Tredici and Nathan P. Havill and Nam Sook Lee and Richard C. Cronn and Kevin R. Cushman and Sarah Mathews and Linda A. Raubeson and Christopher S. Campbell},
  journal={Systematic Botany},
  pages={1 - 15}
Abstract Species delimitation in Pinaceae is often challenged by limited morphological differentiation and introgression. In Tsuga (hemlocks), species delimitation has been most challenging among northeastern Asian taxa, where the species are weakly marked morphologically and range in number from three to five in previous studies. Two low-copy nuclear four-coumarase-ligase (4CL) genes andmorphology strongly support a clade of the Japanese endemic T. diversifolia and T. sieboldii from Japan… 
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