Plants (50-)60-100(-150) cm. Leaves: basal 25-54 cm, proximal cauline 25-32 cm, proximal cauline blades deltate (distal appearing sessile, petioles prominently winged). Involucres cylindric, 8-12.5 mm. Phyllaries 7-9. Florets 10-14; corollas pale greenish white, 9-10 mm; anthers 1.5-2 mm. Cypselae light golden brown with darker brown veins, 6-9 mm; pappi 4-6 mm. 2n = 40.

Flowering fall. Hydric hammocks; 0-10+ m; Fla.

Hasteola robertiorum is known only from Lake and Levy counties.