Absolutely no idea what kind of plant this is, but it's a few million years old. It's a chip or flake of fossilized vegetation in a bit of mudstone, Topanga Canyon State Park, Santa Monica Mountains, about 2 cm long. There's a bunch of places where you can fine really fine-grained sedimentary rock, but only a few places where you can find fossils--mostly marine shells, a few tiny fish bones, and a few bits of miscellaneous detritus such as this. The rock is so bland and uniform that anything like this really stands out.
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