Vernonia glauca (L.) Willd.

Plants 6–10+ dm. Stems sparsely appressed-puberulent, glabrescent. Leaves mostly cauline; blades lanceolate to oblanceolate, 10–15(–18+) cm × 30–45(–70+) mm, l/w = 2.5–3.5(–4), abaxially scabrellous (hairs awl-shaped), resin-gland-dotted or not, adaxially glabrous or sparsely puberulent. Heads in corymbiform to paniculiform arrays. Peduncles 2–35 mm. Involucres ± hemispheric, 5–8 × 7–8 mm. Phyllaries 40–60 in 5–6 series, sparsely puberulent to tomentulose, glabrescent, margins ciliolate, the outer lance-deltate to subulate, 1–3 mm, inner oblong, 4–7+ mm, tips acuminate to subulate or filiform. Florets 30–45+. Cypselae 3–4 mm; pappi stramineous to whitish, outer subulate scales or bristles 30, 0.5–1.5+ mm, intergrading with 30+, 6–8 mm inner subulate scales or bristles. 2n = 34.

Serratula glauca Linnaeus, Sp. Pl. 2: 818. 1753

Vernonia glauca (L.) Wilid. Sp. PI. 3: 1633. 1804
Serratula glauca L. Sp. PI. 818. 1753.
Suprago glauca Gaertn. Fruct. 2: 402. 1791.
Vernonia noveboracensis lalifolia A. Gray, Syn. Fl. N. Am. 1': 89, in part. 1884.
Vernonia noveboracensis tomentosa Britton; Britt. & Brown, 111. Fl. 3: 302, excl. syn. 1S98. Stems erect, 10-16 dm. high, glabrous or nearly so; leaf-blades narrowly ovate-lanceolate
or elliptic-lanceolate to almost ovate, 10-25 cm. long, 2-10 cm. wide, short-acuminate, sharply
and saliently dentate, abruptly narrowed at base into a short margined petiole, glabrous or
scabrellate above, paler and thinly puberulent beneath and frequently brown-pubescent on
the veins; inflorescence loose, flattened, 1-3 dm. wide; heads 34-47-flowered; involucre broadly
campanulate to hemispheric, 6-7 mm. high; scales closely imbricate, glabrous or puberulent
on the back, arachnoid-ciliate, frequently resinous, lanceolate to triangular-ovate at the
appressed base, some or all acuminate into a filiform tip 2-5 mm. long; achenes nearly glabrous
on the prominent ribs, sparsely glandular in the furrows, 3.5 mm. long; pappus tawny or
straw-colored, the bristles 6-7 mm., the outer scales 0.5-1 mm. long.
Type locality : Maryland.
Distribution: Pennsylvania to Georgia and Alabama.

Vernonia glauca is a species of flowering plant in the family Asteraceae. It is endemic to the United States.

Vernonia glauca adalah spesies tumbuhan yang tergolong ke dalam famili Asteraceae. Spesies ini juga merupakan bagian dari ordo Asterales. Spesies Vernonia glauca sendiri merupakan bagian dari genus Vernonia. Nama ilmiah dari spesies ini pertama kali diterbitkan oleh Willd..

Vernonia glauca là một loài thực vật có hoa trong họ Cúc. Loài này được (L.) Willd. miêu tả khoa học đầu tiên năm 1803.