Vernonia lindheimeri |
Vernonia fasciculata |
|
---|---|---|
woolly ironweed |
prairie ironweed, smooth ironweed, western ironweed |
|
Habit | Plants 2–5(–8+) dm. | Plants 3–12+ dm. |
Stems | ± pannose. |
puberulent, glabrescent. |
Leaves | mostly cauline; blades linear, 5–8 cm × 2–4 mm, l/w = 17–25(–40), abaxially densely sericeo-tomentose, adaxially usually glabrate, sometimes sparsely arachno-tomentose. |
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 | 5–35 mm. |
1–8(–12+) mm. |
Involucres | ± obconic to campanulate, 6–10 × 5–8 mm. |
± campanulate, 5–7(–8+) × 4–6 mm. |
Florets | 12–24+. |
12–25+. |
Phyllaries | 40–50+ in 5–6+ series, sericeo-tomentose, including margins, the outer lance-ovate, 1–2 mm, the inner lanceolate to lance-linear, 6–7(–9+) mm, tips acute. |
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 arrays. |
in congested, corymbiform arrays. |
Cypselae | 3–4 mm; pappi stramineous to purplish, outer scales 20+, 0.6–1.1 mm, contrasting with 20+, 6–7+ 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 lindheimeri |
Vernonia fasciculata |
|
Phenology | Flowering Jun–Aug. | Flowering Jul–Sep. |
Habitat | Calcareous soils, rocky banks | Bottomlands, ditches, low prairies |
Elevation | 300 m (1000 ft) | 100–1200 m (300–3900 ft) |
Distribution |
AR; TX; Mexico (Coahuila)
|
CO; IA; IL; IN; KS; KY; MA; MN; MO; ND; NE; OH; OK; SD; WI; MB
|
Source | FNA vol. 19, p. 210. | FNA vol. 19, p. 211. |
Parent taxa | Asteraceae > tribe Vernonieae > Vernonia | Asteraceae > tribe Vernonieae > Vernonia |
Sibling taxa | ||
Synonyms | V. fasciculata subsp. corymbosa, V. fasciculata var. corymbosa | |
Name authority | A. Gray & Engelmann: Proc. Amer. Acad. Arts 1: 46. (1847) | Michaux: Fl. Bor.-Amer. 2: 94. (1803) |
Web links |