Phagnalon ×dertosense Sennen (1929: 42)

Montes-Moreno, Noemí, Garcia-Jacas, Núria, Nualart, Neus, Susanna, Alfonso & Sáez, Llorenç, 2018, Typification of plant names referable to Phagnalon (Compositae) with some taxonomic notes, Phytotaxa 360 (1), pp. 1-18 : 5-6

Phagnalon ×dertosense Sennen (1929: 42)

Type:—[ SPAIN.] Tarragone : Tortose, rochers calcaires, 13 April 1922, Sennen 4428 (lectotype: BC-SENNEN barcode BC945734 !, designated here; isolectotypes: BC-SENNEN barcode BC945736 !, BC barcode BC31379 !, BM barcode BM001025794 !, MA number MA124769 !, Herb. F. Sennen II number 12601!, P barcodes P02829260 and P04034925 [digital images!], W number W1926-23065 !) .

(Image available at: http://www.ibb.csic.es/herbari/ JPEG / BC 945734.jpg).

= Phagnalon × caroli Pau ex Vicioso (1916: 144) [ Ph. rupestre (L.) DC. × Ph. sordidum (L.) Rchb.]

Notes:—The locality and exsiccata number indicated in the original description are: “Hab.- Tarragone: Tortose, rochers à conglomérats des coteaux Nº 4428”. We selected the specimen BC-SENNEN 945734 as the lectotype because of its good preservation status. Moreover, it is kept in Sennen’s personal collection at BC and matches the original description. The type material appears to be morphologically intermediate between Ph. sordidum and Ph. rupestre . This may be attributed to recent hybridization events. These intermediate specimens have linear leaves, like those of Ph. sordidum , and solitary capitula like those of Ph. rupestre . In some specimens, the peduncle is branched and bears two capitula, whereupon they may also be more or less arranged but not forming glomerules. The outermost and middle involucral bracts are ovate with flat margins, similar to Ph. sordidum and Ph. rupestre .