Palmerella is a genus of plants in the family Campanulaceae.

It has only one known species, Palmerella debilis, long known by the synonym Lobelia dunnii.

It is native to 8 counties in southern California (San Diego, Orange, Riverside, San Bernardino, Los Angeles, Ventura, Santa Barbara and Monterey) plus the northern part of Baja California.

[1][2][3][4] The oldest name for the plant is Palmerella debilis, coined by Asa Gray in 1876.

More recent publications favor reverting to Gray's older name.