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Photo#295596
galls? - Pontania

galls? - Pontania
El Dorado Nature Center, Long Beach, Los Angeles County, California, USA
June 28, 2009
Size: about 5-7mm diameter
I think the plant was some kind of willow... would these be galls of Pontania californica?

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galls? - Pontania galls? - Pontania

Pontania, yes
I don't know these well enough to confirm species though.

 
Yes, Salix
This is a willow. More specifically, it is a species with long, narrow leaves that are green on both sides, which could help to narrow down the choices.