Aesculus californica; Famous specimen at corner of McAllister and Willard North in San Francisco. Sorry, no leaves this time of year!
a.k.a. "California Live Oak"; Very large, multi-trunked specimens on Lick Hill between Stanyan Gate walk and Horseshoe Courts rest facilities
This project is for collecting citizen science data to help train the iPhone Leafsnap app. This project has some pretty specific rules (leaves must be photographed against a white background etc.) so please go to the Leafsnap Project Website for detailed information on how to contribute.