That's a stonecrop, genus Sedum. They can be a little tricky to identify, but in your area it might be Sedum stenopetalum (http://en.wikipedia.org/wiki/Sedum_stenopetalum) or Sedum oreganum (http://en.wikipedia.org/wiki/Sedum_oreganum), or it could be an introduced species (but I bet it's a native).
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