Vernonia arkansana |
Vernonia noveboracensis |
|
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Arkansas ironweed, great ironweed |
New York ironweed |
|
Habit | Plants 8–12(–20) dm. | Plants 8–12(–20) dm. |
Stems | scabrellous to pilosulous, glabrescent. |
puberulent, glabrescent. |
Leaves | 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. |
mostly cauline; blades ± lanceolate, 9–15(–25+) cm × 15–45(–60+) mm, l/w = (3.3–)4–6+, abaxially scabrellous, tomentose, or pannose, resin-gland-dotted, adaxially scabrellous, often resin-gland-dotted. |
Peduncles | 2–5 cm. |
2–35 mm. |
Involucres | ± hemispheric, 11–15 × 11–15 mm. |
± hemispheric, 6–10 × 7–10 mm. |
Florets | 50–100+. |
30–45(–65). |
Phyllaries | (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. |
35–60+ in 4–6+ series, sparsely tomentulose, glabrescent, margins ciliolate, the outer lanceolate to subulate, 1–3 mm, inner oblong, 7–9+ mm, tips subulate to filiform. |
Heads | in ± corymbiform arrays. |
in corymbiform to paniculiform arrays. |
Cypselae | 3–5 mm; pappi fuscous to purplish, outer scales 25–30+, 0.5–1 mm, contrasting with 25–30+, 5–7 mm inner bristles. |
3.5–4+ mm; pappi fuscous to purplish, outer scales 20, 0.2–0.6+ mm, contrasting with 30–40+, 5–7+ mm inner bristles. |
2n | = 34. |
= 34. |
Vernonia arkansana |
Vernonia noveboracensis |
|
Phenology | Flowering Aug–Oct. | Flowering Aug–Oct. |
Habitat | Leas, roadsides, stream banks, in sand or on limestone | Abandoned fields, marshes, roadsides |
Elevation | 200–300 m (700–1000 ft) | 10–600 m (0–2000 ft) |
Distribution |
AR; KS; MO; OK
|
AL; CT; DC; DE; FL; GA; MA; MD; NC; NJ; NY; PA; RI; SC; TN; VA; WV
|
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. 208. | FNA vol. 19, p. 209. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | V. crinita | Serratula noveboracensis, V. harperi, V. noveboracensis var. tomentosa |
Name authority | de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 7: 264. (1838) | (Linnaeus) Michaux: Fl. Bor.-Amer. 2: 95. (1803) |
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