Vernonia lettermannii |
Vernonia angustifolia |
|
---|---|---|
narrowleaf ironweed, slimleaf ironweed |
tall ironweed |
|
Habit | Plants (2–)5–6+ dm. | Plants 5–10+ dm. |
Stems | glabrous or glabrate. |
sparsely appressed-puberulent, glabrescent. |
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). |
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 | 6–20+ mm. |
8–25 mm. |
Involucres | narrowly campanulate, 7–9(–10+) × 4–5+ mm. |
± campanulate to obconic, 5–7(–10) × 4–6(–9) mm. |
Florets | 10–12+. |
12–20(–30). |
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. |
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 arrays. |
in ± corymbiform to paniculiform arrays. |
Cypselae | 3–4 mm; pappi fuscous to purplish, outer scales 25+, 0.1–0.5 mm, contrasting with 35+, 6–7+ mm inner bristles. |
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. |
= 34. |
Vernonia lettermannii |
Vernonia angustifolia |
|
Phenology | Flowering Jul–Aug. | Flowering Jun–Aug. |
Habitat | Flood plains, terraces | Pine barrens, oak woodlands |
Elevation | 100–200 m (300–700 ft) | 10–50 m (0–200 ft) |
Distribution |
AR; OK
|
AL; FL; GA; LA; MS; NC; SC
|
Source | FNA vol. 19, p. 211. | FNA vol. 19, p. 209. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | V. angustifolia subsp. mohrii, V. angustifolia subsp. scaberrima, V. angustifolia var. scaberrima, V. scaberrima | |
Name authority | Engelmann ex A. Gray: Notes Compositae, 78. (1880) | Michaux: Fl. Bor.-Amer. 2: 94. (1803) |
Web links |