Deciduous Azaleas

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Extra Plant of the Week Deciduous Azaleas This group of Rhododendrons is also referred to as ‘Mollis Azaleas’, possibly a corruption of R. molle, a species from China which has been used as a hybrid parent of the many forms in cultivation. As a group Rhododendron luteum these deciduous Rhododendron species are exclusively Northern Hemisphere. Their range is from Western USA (R. occidentale) to Japan (R. japonicum) via Europe (R. luteum). Hybridisation was developed in the Netherlands at the beginning of the 20th century and flourished further in England. The Knaphill and Exbury strains are particularly noteworthy, the latter along with hundreds of other Rhododendron hybrids being the playthings of Lord Rothschild (and his gardeners!) on his 260 acre (~100 hectare) estate. The deciduous azaleas are very frost hardy but do not thrive in warmer frost free areas. They are readily grown from seed and almost all the cultivars can be interbred. In an effort to produce a Mollis azalea suitable for Sydney gardens, I made more than 60 Mollis crosses between 1975 and 1984. The project was abandoned when I found that Dr Peter Valder had made not 60 but hundreds of crosses using the same range of parents, with the same objectives but without success. Rhododendron occidentale The extra plant of the week is one of the survivors of my experiments – its parents are ‘Yamina Fireglow’ and ‘Gibraltar’ and it has been a feature of the Macquarie Biology Garden for more than 20 years. R. luteum the European deciduous azalea is notable for producing poisonous pollen which can contaminate honey as noted by the ancient Greeks. R. luteum is also another feral Rhododendron in the British Isles although not on the scale of R. ponticum, as it is confined to moister situations rather than open pastures. Rhododendron luteum: commons.wikimedia.org Rhododendron occidentale: tjhsst.edu Rhododendron ‘Gibraltar’: rhododendron.org Roger Hiller, 25.10.2010 Department of Biological Sciences Rhododendron ‘Gibraltar’.

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A Taxonomic Revision of Rhododendron L. Section Pentanthera G
A TAXONOMIC REVISION OF RHODODENDRON L. SECTION PENTANTHERA G. DON (ERICACEAE) BY KATHLEEN ANNE KRON A DISSERTATION PRESENTED TO THE GRADUATE SCHOOL OF THE UNIVERSITY OF FLORIDA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY UNIVERSITY OF FLORIDA 1987 , ACKNOWLEDGMENTS I gratefully acknowledge the supervision and encouragement given to me by Dr. Walter S. Judd. I thoroughly enjoyed my work under his direction. I would also like to thank the members of my advisory committee, Dr. Bijan Dehgan, Dr. Dana G. Griffin, III, Dr. James W. Kimbrough, Dr. Jonathon Reiskind, Dr. William Louis Stern, and Dr. Norris H. Williams for their critical comments and suggestions. The National Science Foundation generously supported this project in the form of a Doctoral Dissertation Improvement Grant;* field work in 1985 was supported by a grant from the Highlands Biological Station, Highlands, North Carolina. I thank the curators of the following herbaria for the loan of their material: A, AUA, BHA, DUKE, E, FSU, GA, GH, ISTE, JEPS , KW, KY, LAF, LE NCSC, NCU, NLU NO, OSC, PE, PH, LSU , M, MAK, MOAR, NA, , RSA/POM, SMU, SZ, TENN, TEX, TI, UARK, UC, UNA, USF, VDB, VPI, W, WA, WVA. My appreciation also is offered to the illustrators, Gerald Masters, Elizabeth Hall, Rosa Lee, Lisa Modola, and Virginia Tomat. I thank Dr. R. Howard * BSR-8601236 ii Berg for the scanning electron micrographs. Mr. Bart Schutzman graciously made available his computer program to plot the results of the principal components analyses. The herbarium staff, especially Mr. Kent D. Perkins, was always helpful and their service is greatly appreciated.
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