Abstract
The newly described Senecio ×riloensis combines the morphological features of S. hercynicus and S. transylvanicus, and grows in subalpine habitats in the Rila Mountains, Bulgaria. It is illustrated with photos of living plants in the locus classicus.
References
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Boissier, E. (1856) Diagnoses plantarum novarum praesertim orientalium nonnullis Europaeis boreali-africanisque additis ser. 2, vol. 3. B. Hermann, Lipsia, 177 pp.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Dimopoulos, P., Raus, T., Bergmeier, E., Constantinidis, T., Iatrou, G., Kokkini, S., Strid, A. & Tzanoudakis, D. (2016) Vascular plants of Greece ? an annotated checklist. Supplement. Willdenowia 46: 301–347. https://doi.org/10.3372/wi.46.46303</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Hayek, A. (1931) Prodromus florae peninsulae Balcanicae. 2. Band: Dicotyledoneae Sympetalae. Repertorium specierum novarum regni vegetabilis. Beihefte 30 (2): 1–1152.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Herborg, J. (1987) Die Variabilität und Sippenabgrenzung in der Senecio nemorensis-Gruppe (Compositae) im europäischen Teilareal. Dissertationes Botanicae 107: 1–262.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Hodálová, I. (1999) Taxonomy of the Senecio nemorensis group (Compositae) in the Carpathians. Biologia 54: 395–404.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Hodálová, I. (2002) A new hybrid Senecio ×slovacus from the S. nemorensis group (Compositae) in the West Carpathians. Biologia 57: 75–82.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Linnaeus, C. (1753) Species plantarum. L. Salvius, Holmia, 1200 pp.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Nyárády, E.I. (1964) Senecio L. In: Nyárády, E.I. (ed.) Flora Republicii Populare Romîne, vol. 9. Editura Academiei Republicii Populare Romine, Bucure?ti, pp. 520–587.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Oberprieler, C. (1994) Die Senecio nemorensis-Gruppe (Compositae, Senecioneae) in Bayern. Berichte der Bayerischen Botanischen Gesellschaft 64: 7–54. https://doi.org/10.2478/pbj-2014-0004</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Oberprieler, C., Barth, A., Schwarz, S. & Heilmann, J. (2010) Morphological and phytochemical variation, genetic structure and phenology in an introgressive hybrid swarm of Senecio hercynicus and S. ovatus (Compositae, Senecioneae). Plant Systematics and Evolution 286: 153–166. https://doi.org/10.1007/s00606-010-0295-0</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Rola, K. (2014) Morphometry and distribution of Senecio nemorensis agg. species (Asteraceae) in Poland. Polish Botanical Journal 59: 37–54. https://doi.org/10.2478/pbj-2014-0004</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Szel?g, Z. & Vladimirov, V. (2019) The species intermediate between Hieracium petrovae and H. olympicum (Asteraceae): a treatment of H. kritschimanum and description of a new species from Greece. Phytotaxa 402: 107–113. https://doi.org/10.11646/phytotaxa.402.2.4</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Vangjeli, J., Ruci, B., Mullaj, A., Paparisto, K. & Qosja, X. (2000) Flora e Shqipërisë, vol. 4. Akademia e Shkencave e Republikes se Shqiperise, Tiranë, 502 pp.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Vladimirov, V. (2012) Senecio L. In: Kožuharov, S.I. & An?ev, M.E. (eds.) Flora Republicae Bulgaricae, vol. 11. Editio Academica “Profesor Marin Drinov”, Sofia, pp. 432–449.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Dimopoulos, P., Raus, T., Bergmeier, E., Constantinidis, T., Iatrou, G., Kokkini, S., Strid, A. & Tzanoudakis, D. (2016) Vascular plants of Greece ? an annotated checklist. Supplement. Willdenowia 46: 301–347. https://doi.org/10.3372/wi.46.46303</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Hayek, A. (1931) Prodromus florae peninsulae Balcanicae. 2. Band: Dicotyledoneae Sympetalae. Repertorium specierum novarum regni vegetabilis. Beihefte 30 (2): 1–1152.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Herborg, J. (1987) Die Variabilität und Sippenabgrenzung in der Senecio nemorensis-Gruppe (Compositae) im europäischen Teilareal. Dissertationes Botanicae 107: 1–262.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Hodálová, I. (1999) Taxonomy of the Senecio nemorensis group (Compositae) in the Carpathians. Biologia 54: 395–404.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Hodálová, I. (2002) A new hybrid Senecio ×slovacus from the S. nemorensis group (Compositae) in the West Carpathians. Biologia 57: 75–82.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Linnaeus, C. (1753) Species plantarum. L. Salvius, Holmia, 1200 pp.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Nyárády, E.I. (1964) Senecio L. In: Nyárády, E.I. (ed.) Flora Republicii Populare Romîne, vol. 9. Editura Academiei Republicii Populare Romine, Bucure?ti, pp. 520–587.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Oberprieler, C. (1994) Die Senecio nemorensis-Gruppe (Compositae, Senecioneae) in Bayern. Berichte der Bayerischen Botanischen Gesellschaft 64: 7–54. https://doi.org/10.2478/pbj-2014-0004</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Oberprieler, C., Barth, A., Schwarz, S. & Heilmann, J. (2010) Morphological and phytochemical variation, genetic structure and phenology in an introgressive hybrid swarm of Senecio hercynicus and S. ovatus (Compositae, Senecioneae). Plant Systematics and Evolution 286: 153–166. https://doi.org/10.1007/s00606-010-0295-0</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Rola, K. (2014) Morphometry and distribution of Senecio nemorensis agg. species (Asteraceae) in Poland. Polish Botanical Journal 59: 37–54. https://doi.org/10.2478/pbj-2014-0004</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Szel?g, Z. & Vladimirov, V. (2019) The species intermediate between Hieracium petrovae and H. olympicum (Asteraceae): a treatment of H. kritschimanum and description of a new species from Greece. Phytotaxa 402: 107–113. https://doi.org/10.11646/phytotaxa.402.2.4</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Vangjeli, J., Ruci, B., Mullaj, A., Paparisto, K. & Qosja, X. (2000) Flora e Shqipërisë, vol. 4. Akademia e Shkencave e Republikes se Shqiperise, Tiranë, 502 pp.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Vladimirov, V. (2012) Senecio L. In: Kožuharov, S.I. & An?ev, M.E. (eds.) Flora Republicae Bulgaricae, vol. 11. Editio Academica “Profesor Marin Drinov”, Sofia, pp. 432–449.</span></span></span>
