Index
- Ulmus alata, winged elm
- Ulmus americana, American elm
- Ulmus crassifolia, cedar elm
- Ulmus rubra, red elm, slippery elm
- Uniola paniculata, sea oats
- Urena lobata, caesar-weed
- Urochloa mutica, paragrass
- Urtica chamaedryoides, nettle
- Urtica dioica, stinging nettle
- Utricularia cornuta, horned butterwort
- Utricularia foliosa, leafy butterwort
- Utricularia gibba, cone-spur bladderwort
- Utricularia inflata, floating bladderwort
- Utricularia purpurea, purple bladderwort
- Utricularia radiata, little floating bladderwort
- Utricularia subulata, zigzag bladderwort
- Uvularia floridana, Florida bellwort
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