Vernonia noveboracensis |
Vernonia fasciculata |
|
---|---|---|
New York ironweed |
prairie ironweed, smooth ironweed, western ironweed |
|
Habit | Plants 8–12(–20) dm. | Plants 3–12+ dm. |
Stems | puberulent, glabrescent. |
puberulent, glabrescent. |
Leaves | 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. |
mostly cauline; blades ± lanceolate, 5–12(–20+) cm × 5–18(–40+) mm, l/w = 5–9(–14+), abaxially glabrate (pitted, with awl-shaped hairs in pits), adaxially scabrellous, resin-gland-dotted (sometimes pitted). |
Peduncles | 2–35 mm. |
1–8(–12+) mm. |
Involucres | ± hemispheric, 6–10 × 7–10 mm. |
± campanulate, 5–7(–8+) × 4–6 mm. |
Florets | 30–45(–65). |
12–25+. |
Phyllaries | 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. |
25–35+ in 4–5+ series, glabrescent, margins arachno-ciliolate, the outer lance-ovate, 1–3 mm, inner oblong to linear-oblong, 5–7+ mm, tips acute or rounded-apiculate. |
Heads | in corymbiform to paniculiform arrays. |
in congested, corymbiform arrays. |
Cypselae | 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. |
3.5–4 mm; pappi fuscous to purplish, outer subulate scales or bristles 20–30, 0.5–3+ mm, intergrading with 35–45+, 5–7+ mm inner subulate scales or bristles. |
2n | = 34. |
= 34. |
Vernonia noveboracensis |
Vernonia fasciculata |
|
Phenology | Flowering Aug–Oct. | Flowering Jul–Sep. |
Habitat | Abandoned fields, marshes, roadsides | Bottomlands, ditches, low prairies |
Elevation | 10–600 m (0–2000 ft) | 100–1200 m (300–3900 ft) |
Distribution |
AL; CT; DC; DE; FL; GA; MA; MD; NC; NJ; NY; PA; RI; SC; TN; VA; WV
|
CO; IA; IL; IN; KS; KY; MA; MN; MO; ND; NE; OH; OK; SD; WI; MB
|
Source | FNA vol. 19, p. 209. | FNA vol. 19, p. 211. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | Serratula noveboracensis, V. harperi, V. noveboracensis var. tomentosa | V. fasciculata subsp. corymbosa, V. fasciculata var. corymbosa |
Name authority | (Linnaeus) Michaux: Fl. Bor.-Amer. 2: 95. (1803) | Michaux: Fl. Bor.-Amer. 2: 94. (1803) |
Web links |