| [18737] Surirella pandura | Appellations de Taxon | 18737 |
| [18738] Surirella pediculata | Appellations de Taxon | 18738 |
| [18739] Sellaphora uruguayensis | Appellations de Taxon | 18739 |
| [1874] Rumex maritimus | Appellations de Taxon | 1874 |
| [18740] Surirella scalaris | Appellations de Taxon | 18740 |
| [18741] Surirella sella | Appellations de Taxon | 18741 |
| [18742] Surirella smithii | Appellations de Taxon | 18742 |
| [18743] Surirella utahensis | Appellations de Taxon | 18743 |
| [18744] Surirella testudo | Appellations de Taxon | 18744 |
| [18745] Shionodiscus tetraoestrupii | Appellations de Taxon | 18745 |
| [18746] Stenopterobia eximia | Appellations de Taxon | 18746 |
| [18748] Stauroneis thermicoloides | Appellations de Taxon | 18748 |
| [18749] Stauroneis hyperborea | Appellations de Taxon | 18749 |
| [1875] Rumex obtusifolius | Appellations de Taxon | 1875 |
| [18750] Stauroneis tibestiana | Appellations de Taxon | 18750 |
| [18751] Stauroneis impenda | Appellations de Taxon | 18751 |
| [18752] Stephanodiscus irregularis | Appellations de Taxon | 18752 |
| [18753] Stauroneis italica | Appellations de Taxon | 18753 |
| [18754] Sellaphora tumida | Appellations de Taxon | 18754 |
| [18755] Stauroneis manguini | Appellations de Taxon | 18755 |
| [18756] Stephanodiscus minor | Appellations de Taxon | 18756 |
| [18757] Stauroneis monotica | Appellations de Taxon | 18757 |
| [18758] Stictodiscus buryanus | Appellations de Taxon | 18758 |
| [18759] Stictodiscus californicus | Appellations de Taxon | 18759 |
| [1876] Rumex sanguineus | Appellations de Taxon | 1876 |
| [18760] Stauroneis gaiserae | Appellations de Taxon | 18760 |
| [18761] Surirella turgidoides | Appellations de Taxon | 18761 |
| [18762] Surirella turgida var. margarita | Appellations de Taxon | 18762 |
| [18763] Stauroneis hasta | Appellations de Taxon | 18763 |
| [18764] Stauroneis javanica | Appellations de Taxon | 18764 |
| [18765] Stauroneis kuelbsii | Appellations de Taxon | 18765 |
| [18766] Stauroneis legumen var. integra | Appellations de Taxon | 18766 |
| [18767] Stauroneis lapponica | Appellations de Taxon | 18767 |
| [18768] Stauroneis marina | Appellations de Taxon | 18768 |
| [18769] Sellaphora wetzelii | Appellations de Taxon | 18769 |
| [1877] Portulacaceae | Appellations de Taxon | 1877 |
| [18770] Sextiputeus reticulatus | Appellations de Taxon | 18770 |
| [18771] Syndendrium akibae | Appellations de Taxon | 18771 |
| [18772] Synedra allorgei | Appellations de Taxon | 18772 |
| [18773] Synedra bacillaris | Appellations de Taxon | 18773 |
| [18774] Synedra pseudogoulardii | Appellations de Taxon | 18774 |
| [18775] Synedra superba | Appellations de Taxon | 18775 |
| [18776] Synedra tenuissima | Appellations de Taxon | 18776 |
| [18777] Stephanodiscus yukonensis | Appellations de Taxon | 18777 |
| [18778] Synedra vanheurckii | Appellations de Taxon | 18778 |
| [18779] Stauroneis zairensis | Appellations de Taxon | 18779 |
| [1878] Montia | Appellations de Taxon | 1878 |
| [18780] Triceratium acutum | Appellations de Taxon | 18780 |
| [18781] Tryblionella acuta | Appellations de Taxon | 18781 |
| [18782] Tryblionella adducta | Appellations de Taxon | 18782 |