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Buddleja × weyeriana 'Sungold'
''Buddleja'' × ''weyeriana'' 'Sungold' is a cultivar which arose as a sport of 'Golden Glow' at the nursery of P. G. Zwijnenburg in the Netherlands during the 1960s.〔Hatch, L. (2007). ''Cultivars of Woody Plants''. Vol. 1 (A-G) 2007 Edition. TCR Press Horticultural PDF. books.〕〔Bean, W. J. (1914). ''Trees and shrubs hardy in the British Isles''. Eighth edition, revised by D. L. Clarke, 1989. Vol. 1, A-C. Murray, London.〕 〔De Vogel, P (1967). Keuringen 1966. ''Dendroflora'' 4 (Jan 1967): 61 〕 'Sungold' was accorded the Royal Horticultural Society Award of Garden Merit (record 690) () in 1993, reaffirmed in 2010.〔Royal Horticultural Society (2010). ''Trials Report 2008-2010 Buddleja davidii and its close hybrids''. Trials Office, The Royal Horticultural Society Garden, Wisley.〕〔(【引用サイトリンク】url=http://apps.rhs.org.uk/plantselector/plant?plantid=271 )〕 A particularly floriferous specimen of 'Sungold' was introduced to the USA from Scotland by Mike Dirr in 1995, and propagated there as 'Honeycomb'; it later came top in the public poll of 57 Buddleja species and cultivars conducted by the University of Georgia in 1997. ()
==Description==
'Sungold' is a vigorous shrub growing to a height of if hard-pruned annually, bearing small panicles of rich golden-orange flowers, the panicles acute at the apex, further distinguishing the clone from 'Golden Glow'. Occasionally, near-white secondary panicles appear as sports near the end of the flowering season. The leaves are of average size for the hybrid, and mid-green in colour.〔Moore, P. (2012). ''Buddleja List 2011-2012 Longstock Park Nursery''. Longstock Park Nursery, UK.〕〔Stuart, D. (2006). ''Buddlejas''. RHS Plant Collector Guide. Timber Press, Oregon. ISBN 978-0-88192-688-0〕 The nectar of ''B.'' × ''weyeriana'' is relatively complex, comprising three constituents in almost equal proportions: sucrose, fructose, and glucose, whereas the nectar of the common ''Buddleja davidii'' is almost exclusively sucrose.〔 Percival, M. (1961). Types of nectar in angiosperms. ''New Phytol.'' 60: 235-281. 1965. Pergamon Press, London.〕
Ploidy: ''2n'' = 76. 〔Norman, E. M. (2000). Buddlejaceae. ''Flora Neotropica 81''. New York Botanical Garden, USA〕
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