Key to the species of Ferula subg. Ferula sect. Ferula 1. Terminal leaf segments 0.5-5(6) mm long..........................................................................................................................................2 - Terminal leaf segments usually more than 5 mm long.......................................................................................................................7 2. Terminal leaf segments 0.4-1 mm wide..............................................................................................................................................3 - Terminal leaf segments 1-2 mm wide.................................................................................................................................................6 3 Terminal leaf segments scabrous-hispidulous ............................................................................................................. F. sommieriana - Terminal leaf segments glabrous ........................................................................................................................................................4 4. Leaves four times pinnate, rounded to obovate mericarps............................................................................................. F. marmarica - Leaves five-six times pinnate, elliptical mericarps ............................................................................................................................5 5. Hermaphrodite umbel with 16-28 rays, 20-35 mm long, staminate umbels with 14-18 rays, 8-14 mm long, mericarps 10-13 x 6.5- 8.5 ............................................................................................................................................................................................. F. linkii - Hermaphrodite umbel with 7-14(20) rays, more than 35 mm long, staminate umbels with 6-10 rays, 16-27 mm long, mericarps 6.5-11 x 5-6.5........................................................................................................................................................................ F. loscosii 6. Lower leaf blade 15-40 cm long, terminal leaf segments 1-2 mm long, staminate umbels with 9-12, mericarp 12-14 mm wide...... ............................................................................................................................................................................................ F. tunetana - Lower leaf blade 40-60 cm long, terminal leaf segments 2-6 mm long, staminate umbels with 16-18, mericarp 6-8 mm wide........ ........................................................................................................................................................................................... F. tingitana 7. Lower leaf blade 8-20 cm long, hermaphrodite umbel with 7-12 rays ................................................................................ F. sinaica - Lower leaf blade 20-100 cm long, hermaphrodite umbel with 12-40 rays ........................................................................................8 8. Lower leaf blade up to 100 cm long, four-five times pinnate, with terminal segments 20-40(50) mm long................... F. communis - Lower leaf blade 20-60 cm long, two-four times pinnate, with terminal segments 2-15 mm long ...................................................9 9. Inflorescence with contracted umbels, mericarps 7-10 mm long and 3-6 mm wide, with wings 0.5-1 mm wide............ F. arrigonii - Inflorescence with loose and expanded umbels, mericarps 11-15 mm long and 7-11 mm wide, with wings 1-2 mm wide ...........10 10. Leaf blade green adaxially and glaucous abaxially, mericarp elliptical, 7-8 mm wide, with wings 1-1.2 mm wide........................... ............................................................................................................................................................................................... F. glauca - Leaf blade uniformly green, mericarp rounded to rounded-oblong, 9-11 mm wide, with wings 1.5-2 mm wide ........... F. melitensis

Published as part of Cambria, Salvatore, Brullo, Cristian, Tavilla, Gianmarco, Sciandrello, Saverio, Minissale, Pietro, Galdo, Gianpietro Giusso Del & Brullo, Salvatore, 2021, Ferula sommieriana (Apiaceae), a new species from Pelagie Islands (Sicily), pp. 89-108 in Phytotaxa 525 (2) on page 103, DOI: 10.11646/phytotaxa.525.2.1, http://zenodo.org/record/5701858