SZELĄG, Z., and V. VLADIMIROV. “<em>Senecio</em> ×<em>riloensis</em> (Asteraceae), a New Natural Hybrid between<em> S. hercynicus</em> and <em>S. transylvanicus</em> From Bulgaria”. Phytotaxa, vol. 572, no. 2, Nov. 2022, pp. 144-8, doi:10.11646/phytotaxa.572.2.2.