Vernonia angustifolia |
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tall ironweed |
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Habit | Plants 5–10+ dm. |
Stems | sparsely appressed-puberulent, glabrescent. |
Leaves | mostly cauline; blades (mid stem) lance-linear to filiform, 5–12 cm × 2–4(–8+) mm, l/w = (8–)12–30(–60+), abaxially glabrous but for scattered hairs on midribs or scabrellous (hairs awl-shaped), resin-gland-dotted or not, adaxially scabrellous. |
Peduncles | 8–25 mm. |
Involucres | ± campanulate to obconic, 5–7(–10) × 4–6(–9) mm. |
Florets | 12–20(–30). |
Phyllaries | 22–45+ in 5–6 series, sparsely scabrellous, glabrescent, margins ciliolate, the outer lanceolate to subulate, 1.5–3 mm, inner lance-ovate to lanceolate, 5–9+ mm, tips acuminate to subulate. |
Heads | in ± corymbiform to paniculiform arrays. |
Cypselae | 2.5–3 mm; pappi stramineous to purplish, outer scales 25–30, 0.5–1.2+ mm, contrasting with 35–40+, 5.5–6+ mm inner bristles. |
2n | = 34. |
Vernonia angustifolia |
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Phenology | Flowering Jun–Aug. |
Habitat | Pine barrens, oak woodlands |
Elevation | 10–50 m (0–200 ft) |
Distribution |
AL; FL; GA; LA; MS; NC; SC
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Source | FNA vol. 19, p. 209. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | |
Synonyms | V. angustifolia subsp. mohrii, V. angustifolia subsp. scaberrima, V. angustifolia var. scaberrima, V. scaberrima |
Name authority | Michaux: Fl. Bor.-Amer. 2: 94. (1803) |
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