Subject
- Specific Epithet: strictum 5
- Specific Epithet: stygium 1
- Specific Epithet: subbasilaris 13
- Specific Epithet: subcapillata 14
- Specific Epithet: subsecundum 14
- Specific Epithet: subtile 1
- Specific Epithet: subtilis 2
- Specific Epithet: subulatum 7
- Specific Epithet: sullivantii 1
- Specific Epithet: surinamensis 2
- Specific Epithet: sylvatica 5
- Specific Epithet: tabulare 1
- Specific Epithet: tallulensis 7
- Specific Epithet: tamarisci 2
- Specific Epithet: taxifolius 19
- Specific Epithet: taxirameum 3
- Specific Epithet: tectorum 1
- Specific Epithet: tenax 28
- Specific Epithet: tenella 4
- Specific Epithet: tenellum 3