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New to us garden plant: Dark green, single stem, thin dark green whorled leaves with white center. Tallest one now is 24", and there are several smaller ones. No flowers present in January in PNW (Seattle WA).
UPDATE: Thanks for the quick answers from Raleigh, NC and Vancouver BC!
I agree. Euphorbia lathyris http://davesgarden.com/guides/pf/go/55261/
Can become very weedy in PNW. It's called a Gopher plant/spurge because the gophers hit the roots, the sap is very irritating and they stop digging in that direction.
Here's a pic of one that obviously self-seeded infront of a warehouse amongst the azaleas.