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Cover Illustration: White-flowered form of Syringa vulgaris from the Arnold Arboretum of harvard University. Several hundred cultivars of lilacs were developed from 22 wild species through extensive hybridizatino and artificial selection. The parentage of several of these hybrids was confirmed using restriction site analysis of both chloroplast and nuclear ribosomal DNA. See Kim and Jansen: A chloroplast DNA phylogeny of licals (Syringa, Oleaceae): plastome groups show a strong correlation with crossing groups, pp. 1338-1351 in this issue.
Photo credit: Ki-Joong Kim.
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