Native to (or naturalized in) Oregon:
- Deciduous shrub, 1.5-8 ft (0.5-2.5 m) tall, erect, slender branches. Leaves alternate, simple, blade 2-6 cm long, ovate to cordate, developing before or during anthesis, coarsely toothed and shallowly lobed, teeth apiculate; petiole 410 mm long. Flowers, white petals, oblanceolate, 4-6 mm long, about 50 stamens, 4-5 mm long, sepals 3.5-6 mm long, 3-5 flowers per clusters. The fruit is a soft-bodied achene a few millimeters long.
- Sun or partial shade. Probably best on limestone soils.
- Hardy to USDA Zone 6 Native to a small portion of northern California, specifically the eastern half of Lake Shasta, northeast of Redding, on limestone substrates in shaded cool-air canyons adjacent to creeks.
- cliftonii: after Glen Clifton, he and Dean Taylor discovered the plant in 1992 in an exposed limestone area along California Highway 299 northeast of Redding.
- Portland, Oregon: Hoyt Arboretum