Fritillaria saldaensis Schilke in Floristische Rundbriefe, 33(2): 102-103 (1999 published 2000) ≡ F. pinardii

Fritillaria saranna Stejneger in Proc. U.S. Nat. Mus. vi. (1883) 63, nomen. ≡ F. camschatcensis

Fritillaria scandens Fisch. ex Schult.f. Syst. 7: 397 (1829). ≡ F. verticillata

Fritillaria schliemannii Sintenis in Illustr. Hortic. 31: 106 (1884). ≡ F. bithynica

Fritillaria selenica M.Advay in Nordic Journal of Botany (2023)

Fritillaria serawschanica O.Fedtsch. ex Losinsk. in Komarov, Fl. URSS, iv. 314 (1935), in syn. ≡ F. olgae

Fritillaria serotina Schult.f. Syst. vii. 395, in syn. ≡ F. pyrenaica

Fritillaria serpenticola (Rix) Tekşen & Aytaç Israel J. Pl. Sci. 52(4): 351. 2005 [2004 publ. Feb 2005]

Fritillaria sewerzowii Regel in Bull. Soc. Imp. Naturalistes Moscou 41(1): 443-444 (1868) as F.sewerzowi.

Fritillaria shaanxiica Y.K.Yang, S.X.Zhang & D.K.Zhang in J. Wuhan Bot. Res., 5(2): 133 (1987). ≡ F. taipaiensis

Fritillaria shahuensis, a new species from western Iran M.Advay & M.Rix in Phytotaxa 662 (2024).

Fritillaria shehbazii M.Advay in Nordic Journal of Botany (2023)

Fritillaria shennongjiaensis Y.K.Yang & Z.Zheng in J. Wuhan Bot. Res., 5(2): 136 (1987), with two types cited.

Fritillaria shennongjiaensis Y.K.Yang & Z.Zheng var. zhengbaensis Y.K.Yang & J.X.Yang in J. Wuhan Bot. Res., 5(2): 137 (1987).

Fritillaria shikokiana N.Naruhashi in The Journal Geobotany, 26(4): 88(1979).

Fritillaria shikokiana Naruh. f. yamadae Naruh. in Journal of Japanese Botany 93(2): 134 (2018).

Fritillaria shuchengensis Y.K.Yang, D.Q.Wang & J.Z.Shao in J. Wuhan Bot. Res., 5(2): 140 (1987). ≡ F. anhuiensis

Fritillaria sibthorpiana [Sibth. & Sm.] Baker in Journ. Linn. Soc. 14: 275 (1875 publ. 1874).

Fritillaria sibthorpiana Baker subsp. enginiana A.Byfield & Özhatay in Karaca Arbor. Mag., 3(1): 9 (1995) ≡ F. enginiana

Fritillaria sichuanica S.C.Chen in Acta Bot. Yunnanica, 5(4): 371 (1983).

Fritillaria sieheana Hausskn. ex Hayek in Ann. Nat. Hofmus. Wien, 28: 184 (1914). ≡ F. elwesii

Fritillaria sinica S.C.Chen in Acta Phytotax. Sin., 19(4): 500 (1981).

Fritillaria skorpili Vel. Fl. Bulg. Suppl. I. 269 (1898). ≡ F.gussichiae

Fritillaria sonnikovae Shaulo & Erst in Turczaninowia 13(3): 46-47 (2010)

Fritillaria sororum Jimmy Persson & K.Persson in New Plantsman, 5(2): 114 (1998).

Fritillaria souliei Franch. in Journ. de Bot. 1898, 221. ≡ Lilium souliei (Franchet) Sealy, Kew Bull. 5: 296. 1950.

Fritillaria spetsiotica Kamari in Bot. Chronika, 10: 259 (1991).

Fritillaria sphaciotica Gand. in Bull. Soc. Bot. France, 1915, 62: 156 (1915). ≡ F.messanensis subsp. sphaciotica

Fritillaria sporadum Kamari in Willdenowia, 14(2): 331 (1984 publ. 1985).  

Fritillaria stenanthera (Regel) Regel in Acta Horti Petropolitani 8: 652 (1883).

Fritillaria stenophylla Boiss. & Reut. Diagn. Ser. II. 4: 100 (1859). ≡ F. lusitanica

Fritillaria stracheyi Hook.f. Fl. Brit. Ind. vi. (1892) 353. ≡ Lilium nanum Klotzsch in Klotzsch & Garcke, Bot. Ergebn. Reise Waldemar. 53 (1862).

Fritillaria straussii Bornm. in Mitteilungen Des Thüringischen Botanischen Vereins n. s. 20: 45-46 (1904/05 publ. 1905).

Fritillaria striata Eastw. in Proc. Calif. Acad. Sc. Ser. IV. 20: 136 (1931).  

Fritillaria stribrnyi Velen. in Sitzb. Boehm. Ges. Wiss. 37: 61 (1893).  

Fritillaria subalpina Siehe in Ann. Nat. Hofmus. Wien 28: 183 (1914) ≡ F. bithynica

Fritillaria succulenta Elmer in Coult. Bot. Gaz. 41: 311 (1906). ≡ F. agrestis

Fritillaria sulcisquamosa S.Y.Tang & S.C.Yueh in Acta Acad. Med. Sichuan, 14(4): 327 (1983). ≡ F.unibracteata var. unibracteata

Fritillaria syriaca Hayek & Siehe in Ann. Nat. Hofmus. Wien, 28: 184 (1914). ≡ F. pinardii