Vernonia angustifolia |
Vernonia arkansana |
|
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tall ironweed |
Arkansas ironweed, great ironweed |
|
Habit | Plants 5–10+ dm. | Plants 8–12(–20) dm. |
Stems | sparsely appressed-puberulent, glabrescent. |
scabrellous to pilosulous, 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. |
mostly cauline; blades lance-linear, 6–14(–20) cm × 7–15(–25) mm, l/w = 7–10(–18), abaxially scabrellous (hairs awl-shaped), resin-gland-dotted, adaxially scaberulous, glabrescent, resin-gland-dotted. |
Peduncles | 8–25 mm. |
2–5 cm. |
Involucres | ± campanulate to obconic, 5–7(–10) × 4–6(–9) mm. |
± hemispheric, 11–15 × 11–15 mm. |
Florets | 12–20(–30). |
50–100+. |
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. |
(50–)60–70+ in 5–6 series, scabrellous (and resin-gland-dotted), margins ciliolate, the outer lance-ovate, 3–8+ mm, inner lanceolate, 12–15 mm, tips subulate to filiform. |
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. |
3–5 mm; pappi fuscous to purplish, outer scales 25–30+, 0.5–1 mm, contrasting with 25–30+, 5–7 mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia angustifolia |
Vernonia arkansana |
|
Phenology | Flowering Jun–Aug. | Flowering Aug–Oct. |
Habitat | Pine barrens, oak woodlands | Leas, roadsides, stream banks, in sand or on limestone |
Elevation | 10–50 m (0–200 ft) | 200–300 m (700–1000 ft) |
Distribution |
AL; FL; GA; LA; MS; NC; SC
|
AR; KS; MO; OK
|
Discussion | Vernonia arkansana was published in April, V. crinita in October 1838. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
|
Source | FNA vol. 19, p. 209. | FNA vol. 19, p. 208. |
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 | V. crinita |
Name authority | Michaux: Fl. Bor.-Amer. 2: 94. (1803) | de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 7: 264. (1838) |
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