I don't recall this plant being purple when in bloom -- I thought it might be purple Loosestrife. It grows in a local wetland -- not sure you can identify it when it's dried out as in these first two photos. The second 2 photos are of a pink flower that also grows in the laguna. Thanks.
The first is a species of Rumex - I don't think I can ID it from the photographs. The second, I don't know offhand.
#2 is a Polygonum Sp. Example below. http://en.wikipedia.org/wiki/Image:Polygonum_persicaria_bgiu.jpg HTH Chris
