White Indian Plantain

Arnoglossum album is known only from Bay and Gulf counties.

Plants 80–100+ cm. Stems strongly ridged. Basal leaves: (petioles 12–18+ cm) blades (lateral veins appressed to midveins 2–4 cm, then spreading) broadly ovate to narrowly oblong-lanceolate, 15–37 cm, margins usually entire, rarely sinuate or serrulate-denticulate. Cauline leaves: proximal petiolate, blades ovate (12–18+ cm, bases cuneate), margins serrate (apices acuminate); distal sessile, smaller. Involucres 10–12.5+ mm. Phyllaries (chalky white) ± ovate, midvein wings highest at bases. Corollas white, rarely tinged with pink, 9–10.5 mm. Cypselae cylindric to narrowly clavate, 4.2–5 mm; pappi 6–7 mm. 2n = 50.

Arnoglossum album, the Bay County Indian plantain, is a rare Florida species of plants in the sunflower family, first described to modern science in 1998. It has been found only in Bay and Gulf Counties in the Florida Panhandle.

Arnoglossum album is a plant growing up to 100 cm (40 inches) tall. Flower heads are white, occasionally with a pink tinge. The species grows in poorly drained acidic soils.