P. alba may refer to: * Plumeria alba, a large evergreen shrub species native from Central America and the Caribbean * Populus alba, the white poplar, a tree speciesnative from Spain and Morocco through central Europe to central Asia * Prenanthes alba, the white rattlesnake root, a plant species * Prosopis alba, the algarrobo blanco, a tree species found in Argentina * Pseudofumaria alba, the white corydalis, a plant species