Umbrella-sedge
Unbrella Plant
Unicorn-plant
Upland Bentgrass
Upland Brittle Bladderfern
Upland Cotton
Upland Swampprivet
Upright Burhead
Upright Prairie Coneflower
Upright Sedge
Urena
Uruguayan Fountaingrass
Uruguayan Pampas Grass
Uruguayan Vervain