Bit of a tough call on dried out stuff like this but I think Lars is right and Gerado is probably spot on. It certainly looks like dried up Papyrus - Cyperus papayrus: http://en.wikipedia.org/wiki/Cyperus_papyrus
If it's wild, it's invasive:http://www.calflora.org/cgi-bin/species_query.cgi?where-calrecnum=8543
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