Rhodora 70: 483. 1968.
Plants 50–140(–180) cm. Stems glabrous. Leaves: basal oblanceolate to obovate, mostly 9–50 cm; proximal cauline well developed, gradually reduced distally, clasping, faces not gland-dotted. Heads in flat-topped, corymbiform arrays. Peduncles glabrous. Involucres 3.5–5 mm. Phyllaries 5–12 in 1–2(–3) series, oblanceolate, gland-dotted, apices obtuse. Receptacles epaleate or partially paleate (paleae 1–2). Corollas glandular, lobes 0.8–1 mm. Cypselae glandular; pappus bristles in ± 1 series.
Ala., Fla., Ga., La., Miss., N.C., S.C.
Varieties 2 (2 in the flora).
|1||Plants with strong odor of coumarin or vanilla; basal leaves usually more than 15 × 5 cm; midstem leaves broadly elliptic, margins often shallowly dentate, apices flared away from stems; primary head-bearing branches diverging from main axes at 10–20°; florets mostly 7–10||Carphephorus odoratissimus var. odoratissimus|
|1||Plants with slight or no odor of coumarin or vanilla; basal leaves less than 15 × 4 cm; midstem leaves narrowly elliptic, margins entire, apices appressed to stems; primary head-bearing branches diverging from main axes at 30–45°; florets mostly 10–14||Carphephorus odoratissimus var. subtropicanus|