Water Plants : A Study of Aquatic Angiosperms/ Agnes Arber.

Part I. Water Plants as a Biological Group, with a Consideration of Certain Typical Life-histories: 1. Water plants as a biological group 2. The life-history of the Alismaceae 3. The life-history of the Nymphaeaceae and of Limnanthemum 4. The life-history of Hydrocharis, Stratiotes, and other fresh-water Hydrocharitaceae 5. The life-history of the Potamogetonaceae of fresh waters 6. The life-history of the Lemnaceae and of Pistia 7. The life-history of Ceratophyllum 8. The life-history of the aquatic Utricularias and of Aldrovandia 9. The life-history of the Tristichaceae and Podostemaceae 10. The life-history of the marine Angiosperms

Part II. The Vegetative and Reproductive Organs of Water Plants, Considered Generally: 11. Leaf types and Heterophylly in aquatics 12. The anatomy of submerged leaves 13. The morphology and vascular anatomy of aquatic stems 14. The aerating system in the tissues of Hydrophytes 15. Land forms of water plants, and the effect of water upon land plants 16. The roots of water plants 17. The vegetative reproduction and wintering of water plants 18. The flowers of water plants and their relation to the environment 19. The fruits, seeds and seedlings of water plants

Part III. The Physiological Conditions of Plant Life in Water: 20. Gaseous exchange in water plants 21. Absorption of water and transpiration current in Hydrophytes 22. The influence of certain physical factors in the life of water plants 23. The ecology of water plants

Part 4. The Study of Water Plants from the Phylogenetic and Evolutionary Standpoints: 24. The dispersal and geographical distribution of water plants 25. The affinities of water plants and their systematic distribution among the Angiosperms 26. The theory of the aquatic origin of Monocotyledons 27. Water plants and the theory of natural selection, with special reference to the Podostemaceae 28. Water plants and the 'Law of loss' in evolution Bibliography; Index.

Agnes Arber (1879-1960) was a British botanist specialising in plant morphology and comparative anatomy. First published in 1920, this volume provides a detailed anatomical study of aquatic flowering plants, with a discussion of their evolutionary history. Arber's account was the first general description of these plants to be published.