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Chloroplast DNA , nuclear DNA, ITS, trnL-F, cpDNA, nrDNA, phylogeny, Ericaceae, molecular marker, DNA sequence, Kalmia hybrid, Rhododendron hybrid.
Two putative hybrids between Kalmia and Rhododendron are cultivated by enthusiasts and their status has always been the subject of debate. Morphological assessments have not settled the arguments and one taxon has never flowered.
The two cultivars and their suspected progenitor species and related taxa were submitted to DNA sequencing of cpDNA trnL-F and nrDNA ITS regions in order to test whether there was DNA sequence evidence both for hybridization per se and for the direction of the cross, should one be evident.
The putative hybrids represent a distant cross within the Ericaceae, which has taxonomic implications and important consequences for ornamental plant breeding.
Grant M L (2006). Kalmia x Rhododendron is a myth. International Dendrology Society Yearbook 2005.
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Grant M L, Toomey N H & Culham A C (2005). Kalmia x Rhododendron de-bunked. RHS Rhododendron, Camellia & Magnolia Yearbook 2005. RHS, London
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Grant M L, Toomey N H & Culham A C (2004). Is there such a thing as Kalmia x Rhododendron? Journal of the American Society for Horticultural Science 129(4):517-522
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