Researchers from Larry Venable's lab at the University of Arizona have been
studying how climate affects the growth of winter annuals since 1982. This
picture shows part of the study site, which is at Tumamoc Hill in Tucson,
home of UA's Desert Laboratory.
The photo, Tumamoc Hill, Tucson, Ariz., may only be used to illustrate a story about the research described in the accompanying news release, Warming Climate Chills Sonoran Desert's Spring Flowers.