Abstract
Salix vitellina L., or golden willow, was described by C. Linnaeus in 1753. It was later considered to be affiliated with S. alba, and its taxonomic rank has been changed to variety, subspecies, and form. A recent proposal designated it as a form of S. alba × S. fragilis. The goal of this study was to verify the taxonomic designation of S. vitellina using morphological characteristics including ovule number. A few specimens of S. vitellina from Europe and North America, including the lectotype LINN1158.13, were analyzed. It was recorded that S. vitellina has an ovule index of 6-10, with most valves with four and five ovules and less than 50% of valves with five ovules. These ovule parameters were similar to those of S. alba. The other floral characteristics also indicated that S. vitellina is associated with S. alba. No signs of androgyny or flower aberrations, commonly occurring in willow hybrids, were found in the specimens of S. vitellina. Thus, the analyses did not corroborate the hybrid origin of S. vitellina. The ovule analysis also confirmed that f. chermesina with orange-red stems is also a taxon of S. alba, which differs from f. vitellina by a greater ovule index of 12-16.
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