These excellent woodland plants come mainly from North America, with most species in the eastern part, some in the west (with a gap in between), and a few stragglers in Japan and China. As their name implies, they have three of everything: three large leaflets, often beautifully mottled, on each of the leaves, three sepals, and at the centre of the leaves the flower, with three petals, sometimes long and narrow and sometimes broad and showy. They are slow to raise from seed, but once established each thick rhizome gradually multiplies, eventually giving fine clumps. They are all good plants for a leafy soil in a shady places, and the best are stunning. All are well worth waiting for.

Trillium kurabayashii is an excellent plant, robust and vigorous, capable of making spectacular clumps. The three large leaves on each stem are heavily patterned with dark maroon spots, and the flower sits at the centre of the leaves, with three sepals and three deep maroon petals.