Styphnolobium japonicum Millstone™
Common name: 
Millstone Japanese Pagodatree
styf-noh-LOH-bee-um juh-PON-ih-kum
Styphnolobium japonicum 'Hilka'
Sophora japonica 'Hilka'
Native to (or naturalized in) Oregon: 
  • Broadleaf, deciduous tree, rounded form, compact, may reach 45 ft high and 35 ft wide (14 m × 11 m).  Bark is soft and green for many years; later gray-brown, ridged and furrowed.  Leaves are alternate, pinnately compound, usually with 13-15 ovate leaflets, dark green and slightly glossy; yellow fall color.   Creamy white flowers borne in late summer on upright stalks 15-30 cm long.

  • Sun and partial shade.  Best in loamy well-drained soil. Once established withstands heat and drought well.
  • Hardy to USDA Zone 5        A chance seedling of unknown parentage selected for its distinctive rounded canopy and uniform growth habitat by Halka Nurseries of New Jersey, it is named in honor of the township where the renowned nursery is located. Co-introduced by Halka Nurseries and J. Frank Schmidt & Son Co. (PP07,554; 6/11/91), over the years it has shown good resistance to canker infections.
  • Corvallis: street trees on Madison Ave. by the City Hall


Click image to enlarge
  • plant habit, street tree

    plant habit, street tree

  • foliage and flower clusters

    foliage and flower clusters

  • leaf