Brachychiton populneus (seed pod), Kurrajong, San Pedro, California
AKA: Bottle tree, Lacebark kurrajong, Whiteflower kurrajong
Synonym: Brachychiton populneum?
Apparently, the little "hairs" on the seeds will penetrate your skin and cause some irritation. I didn't gather any empirical data on this matter...
I was walking between my hotel and a brewpub and saw these cool seed pods. I wasn't happy with my pictures when I reviewed them later, so I took a walk before my flight back home...
The flowers look like this.
More info: wikipedia