However, recent research has shown that the Taxodiaceae, with the single exception of Sciadopitys, should be merged into the family Cupressaceae. There are no consistent characters by which they can be separated, and genetic evidence demonstrates close relationships; this merging is now becoming widely accepted.
The one exception, the genus Sciadopitys, is genetically very distinct from all other conifers, and now treated in a family of its own, Sciadopityaceae.
Sesqui-, Di-, and Triterpenoids as Chemosystematic Markers in Extant Conifers--A Review.(Statistical Data Included)
Apr 01, 2001; ANGELIKA OTTO [1,2] VOLKER WILDE  I. Abstract Chemosystematics is a common tool in systematics and taxonomy of extant plants....