Editing Trillium (section)

==Description==

Plants of this genus are [[Perennial plant|perennial]] [[Herbaceous plant|herbs]] growing from [[rhizome]]s. There are three large leaf-like [[bract]]s arranged in a whorl about a [[Scape (botany)|scape]] that rises directly from the rhizome. There are no true aboveground leaves but sometimes there are scale-like leaves on the underground rhizome. The bracts are [[photosynthetic]] and are sometimes called leaves. The [[inflorescence]] is a single flower with three green or reddish [[sepal]]s and three [[petal]]s in shades of red, purple, pink, white, yellow, or green. At the center of the flower there are six [[stamen]]s and three [[gynoecium|stigmas]] borne on a very short style, if any. The fruit is fleshy and capsule-like or berrylike. The seeds have large, oily [[elaiosome]]s.<ref name="FNA 133668" /><ref name="FOC 133668" />

Occasionally individuals have four-fold symmetry, with four bracts (leaves), four sepals, and four petals in the blossom.<ref>Kevin Kirkland, [http://www.post-gazette.com/life/garden/2013/05/11/Two-4-petaled-trilliums-found/stories/201305110145 Two 4-petaled trilliums found], Pittsburgh Post-Gazette, May 11, 2013; Trillium erectum and Trillium grandiflorum examples are given.</ref>{{Better source needed|date=July 2019}}. The [[tetramerous]] condition has been described for several species of ''Trillium'' including ''T.&nbsp;chloropetalum'', ''T.&nbsp;erectum'', ''T.&nbsp;grandiflorum'', ''T.&nbsp;maculatum'', ''T.&nbsp;sessile'', and ''T.&nbsp;undulatum''.{{r|Shaver 1959}}