On Nov 23, 2007, macybee from Deer Park, TX (Zone 9a) wrote:
This is a small but striking plant, regardless of whether it is considered a small form of Trillium albidum or a spearate species. Found between the Coast Range and the Cascades in the northern half of Oregon and the southern half of Washington. These trilliums are often associated with stands of Quercus garryana (Garry oak) and Symphoricarpos albus (snow-berry), in fairly moist situations.
This plant has been said to grow in the following regions: