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PRESTON (T.) Flora of Marlborough. Second edition. Part I. 1870. 



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PRIOR (R. C.) On the popular Names of British Plants. London, 1863. 



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PRYOR (A. R.) Flora of Hertfordshire ; edited by B D. Jackson. London, 



1887. 8vo, maps, cloth, lOf. 



PULTENEY (R.) Historical and Biographical Sketches of ihe Progress of 



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PURCHAS AND LEY. A Flora of Herefordshire. Hereford, 1889. 8vo, 



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RALFS (J.) THE BRITISH DESMIDIEAE. London, 1848. 8vo, 35 



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RAVENS HAW (T. F.) New List of the Flowering Plants and Ferns grow- 

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RAY (J.) Synopsis Stirpium Britannicarum. Londini, 1696. i2mo, 



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