This volume comprises the results obtained from the Third Botanical Expedition to Eastern Himalaya (Bhutan, Nepal) in 1967 and the Fourth Expedition (Nepal, Sikkim) in 1969 organized by the University of Tokyo, It also includes supple-mentary remarks to an earlier volume of "The Flora of Eastern Himalaya" pub-lished by the university in 1966 and which was based on the data from the botanical expeditions by the University of Tokyo between 1960 and 1964.

Not only was a large number of botanical specimens and seeds collected, hut also many photographs and records on plants in their habitats were prepared. Some of the photographs have already been published in a book titled "Photo-Album of Plants of Eastern Himalaya" in 1968. Some plants brought back from Himalaya have flowered in Japan, and critical comparative studies on corresponding taxa in Japan and Himalaya are in progress.

We are much indebted to the Government of India, the Government of Nepal, the Government of Bhutan, and the Government of Sikkim for providing us with facilities during our trips. Thanks are especially due to His Majesty J. D. Wang-chuck, the Maharaja of Bhutan, and His Majesty Thondup Namgyal, the Maharaja of Sikkim, without whose help our expeditions could not have been carried out successfully. We wish to express our hearty thanks to Mr. Martam Topdcn, Dr. K. Narashinham, and Mr. K. C. Pradhan of the Government of Sikkim, and Dr. P. R. Pandey and Dr. P. N. Suwal of the Department of Medicinal Plants of the Government of Nepal for their kindness in aiding us in our studies.

We acknowledge the extensive assistance of Mr. Naotomo Sasaki of the National Garden Shinjuku Gyoen, Mr. Atuhiko Aoyama of the Department of Botany, University of Tokyo, and Mr. Kunio Sato of Karuizawa who assisted us greatly in cultivating the Himalayan plants for our studies.

The cost of our expedition in 1967 was partly defrayed by a Grant-in-Aid for Fundamental Scientific Research from the Ministry of Education of Japan.

Finally we wish to take this opportunity to express our warm thanks to all the institutions, banks, companies, and persons that have extended support, financial and otherwise, to our botanical expeditions.

January 1971