Vernonia angustifolia |
Vernonia flaccidifolia |
|
---|---|---|
tall ironweed |
Tennessee ironweed |
|
Habit | Plants 5–10+ dm. | Plants 10–20+ dm. |
Stems | sparsely appressed-puberulent, glabrescent. |
glabrous. |
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. |
mostly cauline; blades ± lanceolate, 10–25(–30+) cm × 15–35(–60+) mm, l/w = 5–7+, abaxially puberulous, not resin-gland-dotted, adaxially scabrellous, glabrescent, not resin-gland-dotted. |
Peduncles | 8–25 mm. |
1–8(–15) mm. |
Involucres | ± campanulate to obconic, 5–7(–10) × 4–6(–9) mm. |
broadly campanulate to hemispheric, 4–5+ × 4–5 mm. |
Florets | 12–20(–30). |
15–25+. |
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. |
30–45+ in 5–6 series, glabrescent, margins ciliolate, the outer lance-ovate, 1–3 mm, inner lance-oblong to oblong, 3.5–5 mm, tips rounded. |
Heads | in ± corymbiform to paniculiform arrays. |
in paniculiform-scorpioid 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. |
3–3.5 mm; pappi stramineous to whitish, outer scales 25–35, 0.8–1.1 mm, contrasting with 35–45+, 5–6+ mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia angustifolia |
Vernonia flaccidifolia |
|
Phenology | Flowering Jun–Aug. | Flowering Aug. |
Habitat | Pine barrens, oak woodlands | Disturbed places in woodlands |
Elevation | 10–50 m (0–200 ft) | 90–400 m (300–1300 ft) |
Distribution |
AL; FL; GA; LA; MS; NC; SC
|
AL; GA; TN |
Source | FNA vol. 19, p. 209. | FNA vol. 19, p. 212. |
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 | Michaux: Fl. Bor.-Amer. 2: 94. (1803) | Small: Bull. Torrey Bot. Club 25: 144. (1898) |
Web links |