Native to (or naturalized in) Oregon:
- Deciduous tree/shrub, 30-40 ft, (9-12 m), often multi-stemmed. Leaves alternate, simple, broad-obovate to obovate, 8-15 cm long, half as wide, abruptly pointed, tapering to cuneate at the base, dark green above and lighter below. Flowers buds, 2.5-4 cm long, silky gray, pubescent. Flowers are white, slightly fragrant, about 13 cm across, with 6(9) petals, with faint purple at the base.
- Sun or partial shade. Not sensitive to soil type.
- Hardy to USDA Zone 5, Snyder (2000) suggests that it may be suitable for protected areas of Zone 4. Native to Japan.
- kobus: from kobushi the Japanese name.
- Corvallis: southeast part of Central Park, near 6th St.
- Oregon State Univ. campus: next to the south wall of Cordley Hall, near southeast entrance.