Vernonia fasciculata |
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prairie ironweed, smooth ironweed, western ironweed |
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Habit | Plants 3–12+ dm. |
Stems | puberulent, glabrescent. |
Leaves | 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 | 1–8(–12+) mm. |
Involucres | ± campanulate, 5–7(–8+) × 4–6 mm. |
Florets | 12–25+. |
Phyllaries | 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 congested, corymbiform arrays. |
Cypselae | 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. |
Vernonia fasciculata |
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Phenology | Flowering Jul–Sep. |
Habitat | Bottomlands, ditches, low prairies |
Elevation | 100–1200 m (300–3900 ft) |
Distribution |
CO; IA; IL; IN; KS; KY; MA; MN; MO; ND; NE; OH; OK; SD; WI; MB
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Source | FNA vol. 19, p. 211. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | |
Synonyms | V. fasciculata subsp. corymbosa, V. fasciculata var. corymbosa |
Name authority | Michaux: Fl. Bor.-Amer. 2: 94. (1803) |
Web links |