A leaf from the extinct sycamore Macginitiea whitneyi, collected between 1933 and 1938 by paleobotanist H. D. Macginitie (who originally called the specimen Platanophyllum whitneyi) from the Chalk Bluff hydraulic gold mine, middle Eocene auriferous gravels, western foothills of California's Sierra Nevada. It resembles the living sycamore Platanus lindeniana of east-central Mexico to Guatemala. Photograph courtesy paleobotanist Diane M. Erwin.

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