- Yaupon Holly
- Yellow alder
- Yellow Anemone
- Yellow archangel
- Yellow Avens
- Yellow Bee-orchid
- Yellow birch
- Yellow bristle-hair ixeris
- Yellow Corydalis
- Yellow Cosmos
- Yellow Crownbeard
- Yellow Foxglove
- Yellow foxtail
- Yellow fritillary
- Yellow Glandweed
- Yellow Horned Poppy
- Yellow Iris
- Yellow jessamine
- Yellow lady's slipper
- Yellow Loosestrife
- Yellow Mariposa Lily
- Yellow passionflower
- Yellow Pimpernel
- Yellow Rattle
- Yellow Salsify
- Yellow Sand Verbena
- Yellow Saxifrage
- Yellow star grass
- Yellow Star-of-Bethlehem
- Yellow Star-Thistle
- Yellow Sweetclover
- Yellow trout lily
- Yellow trumpet flower
- Yellow water-lily
- Yelloweye woodsorrel
- Yerba Mansa
- Yorkshire fog