Editing Trillium (section)

===Subgenus ''Sessilia''===
''Trillium'' subgen.&nbsp;''Sessilia'', the '''sessile-flowered trilliums''', is a group of species that includes ''[[Trillium sessile]]''. The subgenus was [[Circumscription (taxonomy)|circumscribed]] as a [[clade]] of twenty-six (26) species in 2022.{{sfnp|Lampley|Gereau|Floden|Schilling|2022|p=282}} Species in this subgenus have [[Sessility (botany)|sessile]] flowers (no flower stalk), erect petals (except in ''T.&nbsp;stamineum''), and mottled leaves (except in ''T.&nbsp;petiolatum'' and occasionally in plants of other sessile-flowered species).{{r|FNA:312201}}

{{div col}}
* ''[[Trillium albidum]]'' {{small|J.D.Freeman}} – California, Oregon, Washington
* ''[[Trillium angustipetalum]]'' {{small|(Torr.) J.D.Freeman}} – California
* ''[[Trillium chloropetalum]]'' {{small|(Torr.) Howell}} – California
* ''[[Trillium cuneatum]]'' {{small|Raf.}} – Alabama, Georgia, Kentucky, Mississippi, North Carolina, South Carolina, Tennessee
* ''[[Trillium decipiens]]'' {{small|J.D.Freeman}} – Alabama, Florida, Georgia
* ''[[Trillium decumbens]]'' {{small|Harb.}} – Alabama, Georgia, Tennessee
* ''[[Trillium delicatum]]'' {{small|Floden & E.E.Schill.}} – Georgia
* ''[[Trillium discolor]]'' {{small|Hook.}} – Georgia, North Carolina, South Carolina
* ''[[Trillium foetidissimum]]'' {{small|J.D.Freeman}} – Louisiana, Mississippi
* ''[[Trillium gracile]]'' {{small|J.D.Freeman}} – Louisiana, Texas
* ''[[Trillium kurabayashii]]'' {{small|J.D.Freeman}} – California, Oregon
* ''[[Trillium lancifolium]]'' {{small|Raf.}} – Alabama, Florida, Georgia, South Carolina, Tennessee
* ''[[Trillium ludovicianum]]'' {{small|Harb.}} – Louisiana, Mississippi, Texas
* ''[[Trillium luteum]]'' {{small|(Muhl.) Harb.}} – District of Columbia, Georgia, Kentucky, North Carolina, Tennessee
* ''[[Trillium maculatum]]'' {{small|Raf.}} – Alabama, Florida, Georgia, South Carolina
* ''[[Trillium oostingii]]'' {{small|Gaddy}} – South Carolina<ref name="BONAP county"/>
* ''[[Trillium petiolatum]]'' {{small|Pursh}} – Idaho, Oregon, Washington
* ''[[Trillium recurvatum]]'' {{small|L.C.Beck}} – Alabama, Arkansas, Illinois, Indiana, Iowa, Kentucky, Louisiana, Michigan, Mississippi, Missouri, Ohio, Tennessee, Texas, Wisconsin
* ''[[Trillium reliquum]]'' {{small|J.D.Freeman}} – Georgia, South Carolina
* ''[[Trillium sessile]]'' {{small|L.}} – Alabama, Arkansas, District of Columbia, Illinois, Indiana, Kansas, Kentucky, Maryland, Michigan, Missouri, New York, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Virginia, West Virginia
* ''[[Trillium stamineum]]'' {{small|Harb.}} – Alabama, Mississippi, Tennessee
* ''[[Trillium tennesseense]]'' {{small|E. E. Schill & Floden}} – Tennessee
* ''[[Trillium underwoodii]]'' {{small|Small}} – Alabama, Florida, Georgia
* ''[[Trillium viride]]'' {{small|L.C.Beck}} – Illinois, Missouri
* ''[[Trillium viridescens]]'' {{small|Nutt.}} – Arkansas, Kansas, Missouri, Oklahoma, Texas
{{div col end}}