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Two previously unknown willow hybrids, Salix × velchevii (S. amplexicaulis Bory × S. xanthicola K.I. Chr.) and S. × ardana (S. alba L. × S. xanthicola K.I. Chr.), are described from the Bulgarian Rhodope Mts. This is the first report on hybridization in the endemic Balkan species S. xanthicola.doi:10.5586/asbp.2006.017 fatcat:mihs75bsuzfm5odgyc75wfmibq