F. rubra

F. rubra may refer to:
 * Festuca rubra, the red fescue, a grass species found worldwide
 * Filipendula rubra, the queen-of-the-prairie, a medicinal and ornamental plant species native to the United States
 * Foudia rubra, the Mauritius fody, a bird species endemic to the island of Mauritius

Synonyms

 * Frangula rubra, a synonym for Rhamnus rubra, the red buckthorn, a flowering plant species