genus of deciduous conifers comprising both living and fossil forms; 1 extant species: dawn redwood of China; variously classified as member of Pinaceae or Taxodiaceae.

• 落叶松的一属，包含活的和化石类两种形式；现存的种类：中国的拂晓红杉；通常被认为是松科或杉科的一属。