No, The Umbrella flower is not the only thing that starts with u. Unicycle starts with u as well.
Umbrella Flower
Ursinia is a flower. It begins with the letter U.
· Urginea · Ursinia
sun flower
Urginea is a flower. It begins with U.
name of flower that starts with letter A
Iris
Gerbera
aster
Marigold.
Tulip!