A couple BPotD milestones have recently been reached: the 1500th entry occurred about two weeks ago, and today’s entry marks the 5 year anniversary.
Trillium kurabayashii is an uncommonly encountered trillium species of northern California and southwest Oregon. The species is named in honour of Masataka Kurabayashi, a Japanese botanist specializing in Trillium. Kurabayashi, a cytologist and population geneticist, first suggested the possibility that this taxon (previously thought to be a subspecies) was a distinct species. It was later recognized and published as separate species in 1975. Frank Lang, a botanist from Ashland, Oregon, recalls a trillium-exploration trip with Kurabayashi in a 2009 newspaper article asking for public reports of the species.
Giant purple wakerobin often grows in clumps (I have a photograph, but those plants were nearly finished blooming). The plants can reach up to 55cm in height (nearly 2 feet), and the species is available in commerce from specialty nurseries.
For additional photographs, see Trillium kurabayashii from the Oregon Flora Project or view the few images from CalPhotos. Also, you can read about the discovery (and subsequent identification) of some plants in the backyard of The New Dharma Bums, a naturalist weblog from northern California.