Umbrella Flatsedge
Umbrella-sedge
Umbrella-tree
Umbrellaleaf
Unicorn-plant
Upland Bentgrass
Upland Boneset
Upland Brittle Bladderfern
Upland Dewberry
Upland Highbush Blueberry
Upland Swampprivet
Upright Burhead
Upright Carrionflower
Upright Prairie Coneflower
Upright Sedge
Uruguayan Pampas Grass