Excerpt from Contributions to the Flora of Siam: Dicotyledones Since the time of publication in the Bull. Herb. Boiss. (1904-5) by Dr. F. N. Williams of his "Liste des plantes connues du Siam," our knowledge of the Flora of Siam has made great strides. The penultimate part of the Flora of Koh Chang dealing with the Palmae, Lentibularieae and the Lichenes has appeared. As mentioned in Kew Bull. 1911, p.7, Dr. C. C. Hosseus visited Siam in 1904-5 and made large collections of plants. Since his return to Europe he has published in various continental magazines a large number of papers dealing with various subjects of scientific interest, and a list of those papers - so far as known to the author - which have a direct bearing on the present contribution will be given in an addendum. It might not be out of place to say a few words here on those papers which the writer has found most useful when compiling the present lists. Probably the most important are to be found in the Beihefte zum Bot. Centralblatt - "Beitrage zur Flora Siams" in vol. xxvii., pp. 455-507 and "Die botanischen Ergebnisse meiner Expedition nach Siam" in vol. xxviii., pp. 357 - 457. The former gives lists of all the plants of certain families known from Siam, but in the latter the author confines his attention to the plants collected by himself and gives a list of nearly all the plants of his own collection. In both papers the author expresses his indebtedness to various authorities who assisted him in determining the plants. In Engler's Bot. Jahrb., vol. xli., pp. 62-73, Dr. Hosseus gives a list of all the Acanthaceae known from Siam. Most of his plants in this family were determined by the late C. B. Clarke - a recognised authority on Acanthaceae. In the same publication are also to be found "Beitrage zur Flora des Doi Sutap" (vol. xl., pp. 92-99) and "Beitrage zur Flora von Wang Djao am Ma Ping in Mittel Siam" (vol. xlv., pp. 366-374) - two papers dealing with the general aspects of the flora of the regions. Also in Engler's Bot. Jahrb., vol. xli., pp. 55-61, is a description, accompanied with excellent figures and a full discussion on its affinity with neighbouring genera, of a very interesting new genus of Rafflesiaceae, called by the author Richthofenia. Reference might be made here to several other papers, but for these the reader must be referred to the list at the end of the present paper. The present contribution may be regarded as a reprint - with additions - of the papers written by the author and published in Kew Bull. 1911, pp. 7-60 and 385-474. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.