Excerpt from Flora of Tropical Africa, Vol. 6: Oleace? to Gentiane?
The large and constantly increasing mass of material has exceeded the space allotted to it, and has made it necessary to divide the present volume of the "Flora of Tropical Africa" into two sections.
The concluding part of the present section has been delayed as far as practicable in order to include in the Addenda the most recent additions to our knowledge of the Orders described, and especially to bring up to date what has been ascertained with regard to the Apocynace?, which include most of the caoutchouc-.producing plants of Tropical Africa, as well as others yielding medicinal products of great value.
For the amended definition of the regions into which the area of the flora is divided, reference may be made to the preface to the seventh volume.
In the prefaces to the first, fifth, seventh, and eighth volumes, will be found an enumeration of the materials employed up to 18G8, and of the most important additions to them which have reached Kew since.
The further collections at Kew cited in the present volume are:
I. Upper Guinea. - T. B. Dawodu, plants from Lagos. Geheimrath Dr. A. Engler, a collection of Warnecke's plants from Togo. L. Kentish-Rankin, plants from Northern Nigeria. D. Sim, a collection from Liberia. A. Whyte, a collection from Liberia.
III. Nile Land - A. F. Broun, a collection of plants from the Soudan. M. T. Dawe, a collection of plants from Uganda. W. G. Doggett, a collection of plants from Uganda. Sir H. H. Johnston, a collection of plants from Uganda. J. Mahon, a collection of plants from Uganda. C. E. Muriel, a collection of plants from the Blue and White Nile. Captain M. S. Wellby, a collection of plants from South Abyssinia and Lake Rudolph. A. Whyte, a collection of plants from Uganda and British East Africa.
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