| Apiaceae | * |
Sium angustifolium
| L. | Sp. Pl. (ed. 2) 1672 | 1762 |
| Apiaceae | |
Sium apium
| Roth | Fl. Germ. 1: 128 | 1788 |
| Apiaceae | |
Sium berula
| Gouan | Fl. Monsp. 218 | 1765 |
| Apiaceae | |
Sium carsonii
| Durand ex A. Gray | Manual (ed. 5) 196 | 1867 |
| Apiaceae | |
Sium cicutifolium
| Schrank | Baier. Fl. 1: 558 | 1789 |
| Apiaceae | |
Sium conium
| Vest | Man. Bot. 513 | 1806 |
| Apiaceae | |
Sium cyminosma
| Basiner | Bull. Cl. Phys.-Math. Acad. Imp. Sci. Saint-Pétersbourg 2: 204 | 1843 |
| Apiaceae | |
Sium denticulatum
| Baldwin | Sketch Bot. S. Carolina 1(4): 354 | 1817 |
| Apiaceae | |
Sium douglasii
| DC. | Prodr. 4: 125 | 1830 |
| Apiaceae | |
Sium erectum
| Huds. | Fl. Angl. 103 | 1762 |
| Apiaceae | |
Sium falcaria
| L. | Sp. Pl. 1: 252 | 1753 |
| Apiaceae | |
Sium floridanum
| Small | Man. S.E. Fl. 976, 1506 | 1933 |
| Apiaceae | |
Sium formosanum
| Hayata | Icon. Pl. Formosan. 10: 16–17, f. 9 | 1921 |
| Apiaceae | |
Sium frigidum
| Hand.-Mazz. | Symb. Sin. 7(3): 719–720, pl. 11, f. 2–4 | 1933 |
| Apiaceae | |
Sium graecum
| L. | Sp. Pl. 1: 252 | 1753 |
| Apiaceae | |
Sium graveolens
| Vest | Man. Bot. 517 | 1805 |
| Apiaceae | |
Sium heterophyllum
| Greene | Pittonia 2(8C): 102–103 | 1890 |
| Apiaceae | |
Sium incisum
| Torr. | Rep. Exped. Rocky Mts. 90 | 1843 |
| Apiaceae | ** |
Sium incisum
| Pers. | Syn. Pl. 1: 316 | 1805 |
| Apiaceae | |
Sium javanicum
| Blume | Bijdr. Fl. Ned. Ind. (15): 881 | 1826 |
| Apiaceae | |
Sium latifolium
| L. | Sp. Pl. 1: 251 | 1753 |
| Apiaceae | |
Sium latijugum
| C.B. Clarke | | |
| Apiaceae | |
Sium lineare
| Michx. | Fl. Bor.-Amer. 1: 167 | 1803 |
| Apiaceae | |
Sium longifolium
| Pursh | Fl. Amer. Sept. 1: 194 | 1814 [1813] |
| Apiaceae | |
Sium matsumurae
| H. Boissieu | Bull. Herb. Boissier, sér. 2, 3(11): 954 | 1903 |
| Apiaceae | |
Sium medium
| Fisch. & C.A. Mey. | Index Seminum (St. Petersburg) 9: 19 | 1843 |
| Apiaceae | |
Sium neurophyllum
| (Maxim.) H. Hara | Enum. Spermatoph. Jap. 3: 323 | 1954 |
| Apiaceae | |
Sium ninsi
| Thunb. | Fl. Jap. 118 | 1784 |
| Apiaceae | |
Sium nipponicum
| Maxim. | Bull. Acad. Imp. Sci. Saint-Petersbourg, sér. 3 18(3): 286 | 1873 |
| Apiaceae | |
Sium nodiflorum
| L. | Sp. Pl. 1: 251 | 1753 |
| Apiaceae | * |
Sium nodiflorum
| Walter | Fl. Carol. 115 | 1788 |
| Apiaceae | |
Sium novae-mexicae
| Koso-Pol. | Bull. Soc. Imp. Naturalistes Moscou, n.s. 28: 173, f. 1 | 1915 |
| Apiaceae | |
Sium orientale
| Soó | | |
| Apiaceae | |
Sium paniculatum
| Thunb. | | |
| Apiaceae | * |
Sium pusillum
| Nutt. | Fl. N. Amer. 1(4): 611 | 1840 |
| Apiaceae | ! |
Sium pusillum
| Poir. | Encycl. Suppl. 1: 622 | 1811 |
| Apiaceae | |
Sium repandum
| Welw. ex Hiern | Cat. Afr. Pl. 1: 425 | 1898 |
| Apiaceae | |
Sium repens
| Jacq. | Fl. Austriac. 3: 34 | 1775 |
| Apiaceae | |
Sium rigidius
| L. | Sp. Pl. 1: 251–252 | 1753 |
| Apiaceae | |
Sium serrum
| (Franch. & Sav.) Kitag. | J. Jap. Bot. 17(10): 562 | 1941 |
| Apiaceae | |
Sium siculum
| L. | Sp. Pl. 1: 252 | 1753 |
| Apiaceae | |
Sium sisaroideum
| DC. | Prodr. 4: 124 | 1830 |
| Apiaceae | |
Sium sisarum
| L. | Sp. Pl. 1: 251 | 1753 |
| Apiaceae | |
Sium suave
| Walter | Fl. Carol. 115 | 1788 |
| Apiaceae | |
Sium tenue
| Kom. | | |
| Apiaceae | * |
Sium teretifolium
| (Muhl.) Elliott | Sketch Bot. S. Carolina 1: 354 | 1817 |
| Apiaceae | |
Sium thunbergii
| DC. | Prodr. 4: 125 | 1830 |
| Apiaceae | |
Sium tricuspidatum
| Elliott | Sketch Bot. S. Carolina 1(4): 354 | 1817 |
| Apiaceae | |
Sium verrucosum
| J. Gay ex A. Rich. | Tent. Fl. Abyss. 1: 324 | 1848 |
| Apiaceae | |
Sium virescens
| Spreng. | | |
| Apiaceae | |
Sium visnaga
| Stokes | Bot. Mat. Med. 2: 106 | 1812 |