Robinia pseudoacacia 'Umbraculifera'
Native to (or naturalized in) Oregon:
- Deciduous tree/shrub, thornless, dense, trunkless shrub. However, usually it is grafted to a standard at 6-8 ft (1.8-2.4 m) to produce a tree form, which may grow to 20-30 ft (6-9 m) high with a similar width. Rarely flowers.
- Hardy to USDA Zone 4 Originated in France or Austria, about 1810 (Jacobson, 1996).
- Umbraculifera: Latin, meaning umbrella-bearing, a reference to its umbrella or mushroom shape.