PlantFiles: White Bryony
Bryonia alba

I've heard it was introduced in the 1970's. It is originally from England. Washington has it listed as a class-b noxious weed. It is mainly spread by birds eating the berries and by the berries dropping. I believe it is a problem plant. The vines can grow up to 150 feet and cover the tops of trees. It dies in the winter and the dead vines produce a mat that collects snow, weighs down trees and damages them. I've seen some trees on my property overrun by white bryony that have died. The whole plant and berries are poisonous, but can be used for medicinal purposes. I wouldn't recommend getting rid of the plant unless you wear protective clothing. It can irritate the skin easily from the liquid in the roots and stems. The only way I've heard to effectively get rid of it is damaging or removing the root in the spring when it begins to sprout. There may be more ways, but I haven't heard of them. Spraying doesn't work from what I've heard.

Although on some other sites I have read it is said to not grow in Oregon, but it is on the Noxious Weed list in 42 states. And I can attest that it does grow in Oregon. If you get this plant in your yard, I strongly advise you to remove it. Right now, in late April, it has white flowers on it, which will soon change to dark red or almost black berries. It is said that getting the juice of the berries on your skin will cause severe urinary/bladder problems. If livestock eat it, it causes symptoms similar to locoweed, i.e: hallucinations, bowel obstruction, ect.
The only reason I left this plant in the ground, is because I wasn't sure what it was. But I am now. And I am going to remove it. I unfortunately have some digging to do, because it is a tuber plant. It's also otherwise known as Devil's Turnip.