Contents: Abbreviation used in the text. Main headings, their abbreviation, and data incorporated under generic names. 1. Dictionary of commemorative plant genera Kochia to Kyllingia. 2. Additions to Vol. 1. 3. Additions to Vol. 2. 4. Additions to Vol. 3. 5. Additions to Vol. 4. 6. Additions to Vol. 5. 7. Additions to Vol. 6. 8. Additions to Vol. 7. 9. Additions to Vol. 8. 10. Additions to Vol. 10. Index. The present work represents Volume 18 of the projected 27 volumes. It is hoped to cover 18,000 to 20, 000 commemorative names in the total work covering all fields of botany. Scope of the work: Generic names have been used as markers through which light has been thrown on the Botanical History of the region. Influences which have influenced a botanist