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(A general consideration of floating leaves, especially of the 

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Jeffrey, E. C. (1899) The Morphology of the Central Cylinder in the 

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[The section of this paper relating to polystely should be read 

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Johnston, G. (1853) The Botany of the Eastern Borders, London, 1853. 

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(Pp. 191-192 give an early account of the spread of Elodea 

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Jonsson, B. (1883) Der richtende Einfluss stromenden Wassers auf 

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(The author proposes the term " Rheotropismus " for the 

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Jonsson, B. Om befruktningen hos slagtet Najas samt hos 



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(A comparison of these two genera leads the author to the 

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 to Halorrhagideae.) 



Juel, O. (1911) Studien iiber die Entwicklungsgeschichte von Hip- 



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(The author's study of the development of the ovule and 

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[P- 



(In this work Zostera is included among the Aroids, see p. 24.) 



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(The author's observations suggest certain minor corrections 

 in the accounts hitherto published of the flowering of Lemna 

 minor.) 



