SZELĄG, Z., & VLADIMIROV, V. (2022). <em>Senecio</em> ×<em>riloensis</em> (Asteraceae), a new natural hybrid between<em> S. hercynicus</em> and <em>S. transylvanicus</em> from Bulgaria. Phytotaxa, 572(2), 144–148. https://doi.org/10.11646/phytotaxa.572.2.2