PROCEEDINGS OF THE CALIFORNIA ACADEMY OF SCIENCES Fourth Series Vol. XVIII, No. 14, pp. 393-484, plates 33, 34 September 6, 1929 XIV STUDIES IN THE FLORA OF LOWER CALIFORNIA AND ADJACENT ISLANDS BY ALICE EASTWOOD Curator, Department of Botany Introduction In the spring of 1925, the California Academy of Sciences sent an expedition to the Revillagigedo Islands off the Pacific coast of Mexico. The U. S. Navy Department detailed the U. S. mine-sweeper Ortolan for the use of the Academy. Mr. H. L. Mason accompanied the expedition as botanist. On the way to the islands a short stop was made at Guadalupe Island and a small collection of plants was secured. Clarion Island was reached April 26, and from then until May 11, Clarion, Socorro and San Benedicto islands were explored. On the return trip, the vessel stopped at the Tres Marias Islands, May 14-24, and collections were made on Maria Madre, Maria Magdalena and Isabella islands. From there the vessel sailed north along the west coast of Lower California and made landings at Cape San Lucas, Magdalena Bay, Turtle Bay, Cedros Island, San Ouintin Bay, and San Martin Island. Mr. Mason is preparing the report on the Botany of the Revil-lagigedo Islands, but it is not yet ready. The present writer has worked up all the other collections except that from the Tres Marias Islands. The collection on these islands was made at the end of the dry season and the specimens were very poor. Duplicates were sent to Paul C. Standley, an authority September 6, 1929
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