Ulex x breoganii is a hybrid between Ulex europaeus (Gorse) and Ulex gallii (Western Gorse). Gorse is common over the whole of the county. Western Gorse is much more restricted within the county, often being found on the more heathy ground and acid soils. Zoe Delvin the finder said would I like to go and see a gorse she had found, which from photos we thought could be Ulex minor (Dwarf Gorse), a species that has only once been reported from the county back in 1959.
There were 11 bushes of Ulex x breoganii on the side of a disused railway at Mountelliott, a little north of New Ross. The books all say measure a range of flowers, I did this with flowers from all 11 bushes and could see they better fitted between the two species. Ulex europaeus has blue/green stems and foliage and large strong spines, and pale yellow flowers. Whilst Ulex gallii has dark green foliage and week spines and whole plant much more slender, and golden yellow flowers. Ulex x breoganii is somewhere in the middle, foliage is neither blue/green or dark green and the flowers are a deep yellow but not as golden as Ulex gallii. To be sure we sent photos to Jeanne Webb who is very familiar with the hybrid and Jeanne agreed with our ID.