Vernonia angustifolia |
Vernonia lindheimeri |
|
---|---|---|
tall ironweed |
woolly ironweed |
|
Habit | Plants 5–10+ dm. | Plants 2–5(–8+) dm. |
Stems | sparsely appressed-puberulent, glabrescent. |
± pannose. |
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 linear, 5–8 cm × 2–4 mm, l/w = 17–25(–40), abaxially densely sericeo-tomentose, adaxially usually glabrate, sometimes sparsely arachno-tomentose. |
Peduncles | 8–25 mm. |
5–35 mm. |
Involucres | ± campanulate to obconic, 5–7(–10) × 4–6(–9) mm. |
± obconic to campanulate, 6–10 × 5–8 mm. |
Florets | 12–20(–30). |
12–24+. |
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. |
40–50+ in 5–6+ series, sericeo-tomentose, including margins, the outer lance-ovate, 1–2 mm, the inner lanceolate to lance-linear, 6–7(–9+) mm, tips acute. |
Heads | in ± corymbiform to paniculiform arrays. |
in corymbiform 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. |
3–4 mm; pappi stramineous to purplish, outer scales 20+, 0.6–1.1 mm, contrasting with 20+, 6–7+ mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia angustifolia |
Vernonia lindheimeri |
|
Phenology | Flowering Jun–Aug. | Flowering Jun–Aug. |
Habitat | Pine barrens, oak woodlands | Calcareous soils, rocky banks |
Elevation | 10–50 m (0–200 ft) | 300 m (1000 ft) |
Distribution |
AL; FL; GA; LA; MS; NC; SC
|
AR; TX; Mexico (Coahuila)
|
Source | FNA vol. 19, p. 209. | FNA vol. 19, p. 210. |
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) | A. Gray & Engelmann: Proc. Amer. Acad. Arts 1: 46. (1847) |
Web links |