Tema
- Specific Epithet: schreberi 1
- Specific Epithet: scitum 1
- Specific Epithet: scoparium 1
- Specific Epithet: sibirica 1
- Specific Epithet: sordidum 1
- Specific Epithet: splendens 1
- Specific Epithet: spurium 1
- Specific Epithet: squarrosum 1
- Specific Epithet: subbasilaris 1
- Specific Epithet: subsecundum 1
- Specific Epithet: tabulare 1
- Specific Epithet: tenax 1
- Specific Epithet: tenuirostre 1
- Specific Epithet: tenuis 1
- Specific Epithet: texanus 1
- Specific Epithet: triquetrus 1
- Specific Epithet: triste 1
- Specific Epithet: umbratum 1
- Specific Epithet: undulata 1
- Specific Epithet: virginianum 1