Rob Tilley / Western white trillium (Trillium ovatum) in flower, Washington, USA, March

Michael Hutchinson / Coast Trillium {Trillium ovatum} flowering on forest floor beneath Coast Giant redwood trees {Sequoia sempervirens} Lady Bird Johnson Grove, California, USA

Jaymi Heimbuch / Pacific Trillium (Trillium ovatum) flower, Big Creek Park, Newport, Oregon

Michael Durham / Pacific Trillium (Trillium ovatum) blooming in early spring, Oregon

Michael Durham / Pacific Trillium (Trillium ovatum) flower cross section showing the long stem, subterranean bulb and roots, Oregon

Kevin Schafer / Pacific Trillium (Trillium ovatum) flower, Oregon

Visuals Unlimited / Pacific Trillium (Trillium ovatum), Oregon, USA.

Visuals Unlimited / Western Trillium (Trillium ovatum) Kruse Reserve, Salt Point State Park, California, USA.

Visuals Unlimited / Western Trillium (Trillium ovatum) Liliaceae, Western North America.

Jaymi Heimbuch / Pacific Trillium (Trillium ovatum) flower, Big Creek Park, Newport, Oregon

Jaymi Heimbuch / Pacific Trillium (Trillium ovatum) flower, Oregon