Vernonia angustifolia |
Vernonia blodgettii |
|
---|---|---|
tall ironweed |
Florida ironweed |
|
Habit | Plants 5–10+ dm. | Plants 2–3(–5+) dm. |
Stems | sparsely appressed-puberulent, glabrescent. |
glabrous or glabrate. |
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 lance-linear to linear, 3–7+ cm × 2–8+ mm, l/w = 7–15+, abaxially scabrellous (hairs appressed, awl-shaped), resin-gland-dotted, adaxially scabrellous, glabrescent, resin-gland-dotted. |
Peduncles | 8–25 mm. |
12–35 mm. |
Involucres | ± campanulate to obconic, 5–7(–10) × 4–6(–9) mm. |
campanulate to obconic, 6–8 × 6–10 mm. |
Florets | 12–20(–30). |
18–25+. |
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. |
30–40+ in 4–5 series, puberulent, margins arachno-ciliate, the outer lance-ovate, 2–3 mm, inner lance-oblong to linear-oblong, 6–7 mm, tips acute or rounded-apiculate. |
Heads | in ± corymbiform to paniculiform arrays. |
in open, 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. |
2.5–3+ mm; pappi stramineous to whitish, outer scales 25–30, 0.5–1.1 mm, contrasting with 30–40+, 5–7+ mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia angustifolia |
Vernonia blodgettii |
|
Phenology | Flowering Jun–Aug. | Flowering year-round. |
Habitat | Pine barrens, oak woodlands | Damp, peaty or sandy soils |
Elevation | 10–50 m (0–200 ft) | 0–10 m (0–0 ft) |
Distribution |
AL; FL; GA; LA; MS; NC; SC
|
FL; West Indies (Bahamas) |
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: Fl. S.E. U.S., 1160, 1338. (1903) |
Web links |