Subject
- Specific Epithet: triquetrus 3
- Specific Epithet: triste 16
- Specific Epithet: turfacea 5
- Specific Epithet: turgescens 1
- Specific Epithet: uliginosa 4
- Specific Epithet: umbratum 2
- Specific Epithet: uncinata 1
- Specific Epithet: uncinatus 3
- Specific Epithet: undulata 7
- Specific Epithet: undulatum 19
- Specific Epithet: unguiculata 5
- Specific Epithet: varia 3
- Specific Epithet: varium 15
- Specific Epithet: velutinum 1
- Specific Epithet: verticillatum 2
- Specific Epithet: virens 1
- Specific Epithet: virginianum 8
- Specific Epithet: virginica 2
- Specific Epithet: viride 25
- Specific Epithet: viridissimus 2