The hybrid between Doronicum hungaricum and Doronicum orientale: rare or overlooked?

Spontaneous hybrids of two Doronicum species, D. hungaricum and D. orientale, were found in a garden after the first year of their common cultivation. This hybrid has already been found in South Hungary and has been described as D. ×sopianae. The morphological characters of the hybrid with their parents were compared. Because both parental species occur in many Balkan countries, it was assumed that the hybrid is probably overlooked at localities, where both species co-occur.