THE ROYAL BOTANIC GARDEN EDINBURGH EDINBURGH J O U R N AL OF B O T A NY Volume 51, No. 3 EDINBURGH JOURNAL OF BOTANY Edinburgh Journal of Botany is a continuation of Notes from the Royal Botanic Garden Edinburgh. EDITORIAL BOARD Dr B J Coppins (Editor-in-Chief) Mrs N M Gregory (Editor) Mr H J Noltie (Book Review Editor) Miss E J Schwarz (Production Editor) Mr B L Burtt Mr D G Long DrRRMill Mr A G Miller The cover design depicts three rhododendron capsules, adapted from drawings by Lillian Snelling which are housed in the Library of the Royal Botanic Garden Edinburgh. Left, R.forreslii {Forrest 13442), drawn xi 1918; centre, R. hypolepidotum (Forrest 13302), xi 1915; right, R. ungeri (from Mt William), 25 i 1919. © Crown copyright 1994 First published 1994 ISBN Oil 495296 5 Royal Botanic Garden Edinburgh, Inverleith Row, Edinburgh EH3 5LR, UK.