It’s the most wonderful time of the year – when trilliums are in bloom! Since I can’t get out in the woods much right now, instead have some completely useless facts about red trilliums. Red trillium (Trillium erectum), like all trilliums, is a monocot, meaning it arises from a seed with a single cotyledon or seed leaf. Most plants are dicots, which have seeds with two cotyledons, so this makes trilliums a little bit special.