Oregon: What plant is this?

Found growing in sandy soil along the Columbia River near Portland, Oregon, today. A very vivid bright green.

Bigger picture here:
http://imgur.com/j7VPD.jpg

 

Looks like a species of Equisetum. Common name horsetail.

http://en.wikipedia.org/wiki/Equisetum

 

Thanks, there's water horsetails nearby. Didn't know they were so primordial.

 

These look like field horsetail, the hated garden weed.

 

Thanks

I discovered it's easier to grow weeds. As long as you turn the dirt around it, it looks like it's growing there on purpose ;)