Narrow Leaf Ironweed

Plants (2–)5–6+ dm. Stems glabrous or glabrate. Leaves mostly cauline; blades filiform, 5–9+ cm × 1–3+ mm, l/w = 25–50+, abaxially glabrate (pitted, awl-shaped hairs in pits), adaxially puberulent, glabrescent (sometimes pitted). Heads in corymbi-form arrays. Peduncles 6–20+ mm. Involucres narrowly campanulate, 7–9(–10+) × 4–5+ mm. Phyllaries 30–40+ in 5–6+ series, sparsely tomentose, glabrescent, margins arachno-ciliolate, the outer lanceolate to subulate, 1–3 mm, inner oblong to lanceolate, 5–7+ mm, tips acute. Florets 10–12+. Cypselae 3–4 mm; pappi fuscous to purplish, outer scales 25+, 0.1–0.5 mm, contrasting with 35+, 6–7+ mm inner bristles. 2n = 34.

Vernonia lettermannii adalah spesies tumbuhan yang tergolong ke dalam famili Asteraceae. Spesies ini juga merupakan bagian dari ordo Asterales. Spesies Vernonia lettermannii sendiri merupakan bagian dari genus Vernonia. Nama ilmiah dari spesies ini pertama kali diterbitkan oleh Engelm. ex A.Gray.

Vernonia lettermannii là một loài thực vật có hoa trong họ Cúc. Loài này được Engelm. ex A.Gray miêu tả khoa học đầu tiên năm 1880.