{{Short description|Family of flowering plants}} [[File:TrilliumErectum.jpg|thumb|230px|''Trillium erectum'']]
'''Trilliaceae''' was a family of flowering plants first named in 1846; however, most taxonomists now consider the genera formerly assigned to it to belong to the family Liliaceae. The APG IV system, of 2016 (unchanged from the APG system, of 1998), does not recognize such a family either and assigns the plants involved to family Melanthiaceae, tribe Parideae.
Nevertheless, some taxonomists still recognize a separate family Trilliaceae. The most important genus in North America is ''Trillium'', and the taxonomy of that genus has always been controversial.
A recent treatment (Farmer and Schilling 2002) stated that the family Trilliaceae, which exhibits an arcto-tertiary distribution, comprises six genera. Three of these exhibit a wide distribution: * ''Paris'' from Iceland to Japan, * ''Daiswa'' from eastern Asia, and * ''Trillium'' from North America and eastern Asia Three are monotypic, endemic genera: * ''Trillidium govanianum'', with a tepaloid inflorescence, from the Himalayan Mountains; * ''Kinugasa japonica'', with petaloid sepals, from Japan; and * ''Pseudotrillium rivale'', newly segregated, with spotted petals, from the Siskiyou Mountains of California and Oregon.
Within Melanthiaceae, these are consolidated into three genera; ;Parideae * ''Paris'' <small>L.</small> (including ''Daiswa'' and ''Kinugasa'') * ''Pseudotrillium'' <small>S.B.Farmer</small> * ''Trillium'' <small>L.</small> (including ''Trillidium'')
<gallery> File:Paris quadrifolia 050505.jpg|''Paris quadrifolia'' in flower File:Paris quadrifolia (von Oben).jpg|''Paris quadrifolia'' in fruit File:Paris quadrifolia Sturm45.jpg|''Paris quadrifolia'' from Sturm (1796) File:Trilliumgrand.jpg|''Trillium grandiflorum'' File:Trillium luteum1.jpg|''Trillium luteum'' File:Trillium luteum2.jpg|''Trillium luteum'' File:Trillium ovatum 1290.JPG|''Trillium ovatum'' File:Trillium tschonoskii s2.jpg|''Trillium tschonoskii'' </gallery>
== External links == * [http://www.goldsword.com/sfarmer/Trillium/index.html Susan Farmer's web pages on Trilliaceae and the genus ''Trillium''] * [http://www.goldsword.com/sfarmer/Article/index.html Farmer & Schilling 2002 -- article in Systematic Botany on Trilliaceae] * [http://delta-intkey.com/angio/www/trilliac.htm Trilliaceae] in L. Watson and M.J. Dallwitz (1992 onwards). ''[http://delta-intkey.com/angio/ The families of flowering plants]: descriptions, illustrations, identification, information retrieval.'' Version: 3 May 2006. http://delta-intkey.com. * [http://www.csdl.tamu.edu/FLORA/cgi/gateway_family?fam=Trilliaceae links at CSDL, Texas] * [https://web.archive.org/web/20071108111139/http://www.goldsword.com/sfarmer/Trillium/TrilliaceaeHistory.pdf history and placement of taxa in Trilliaceae] * [http://www.plantbio.uga.edu/~wendyz/Melanth%20family%20chart.html morphological characters of genera] within Melanthiaceae sensu APG II
{{Taxonbar|from=Q1858126}} {{Authority control}}
Category:Historically recognized angiosperm families