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Contents: Foreword. Preface. Acknowledgements. Abbreviations. Introduction. Monographs: 1. Wagatea. 2. Waldhamia. 3. Wallichia. 4. Walsura. 5. Waltheria. 6. Wasabia. 7. Wattakaka. 8. Wedelia. 9. Wendalandia. 10. Wikstroemia. 11. Wisteria. 12. Withania. 13. Wolffia. 14. Woodfordia. 15. Woodwardia. 16. Wrightia. 17. Xanthium. 18. Xanthochymus. 19. Xanthosoma. 20. Xeromorphis. 21. Xerospermum. 22. Ximenia. 23. Xolisma. 24. Xylia. 25. Xylocarpus. 26. Xylopia. 27. Xylosma. 28. Xyris. 29. Yucca. 30. Zaleya. 31. Zamia. 32. Zantedeschia. 33. Zanthoxylum. 34. Zataria. 35. Zea. 36. Zehneria. 37. Zephyranthes. 38. Zingiber. 39. Zinnia. 40. Ziziphus. 41. Zornia. 42. Zostera. 43. Zuccagnia. 44. Zygopetalum. Appendices. Indices. Plant Genera Included in Earlier Volumes.