Vernonia missurica |
Vernonia fasciculata |
|
---|---|---|
Missouri ironweed |
prairie ironweed, smooth ironweed, western ironweed |
|
Habit | Plants 6–12(–20+) dm. | Plants 3–12+ dm. |
Stems | puberulent. |
puberulent, glabrescent. |
Leaves | mostly cauline; blades elliptic to lance-ovate or lanceolate, 6–16(–20+) cm × 18–48+ mm, l/w = 2.5–4(–6+), abaxially usually puberulent to tomentose or pannose (hairs ± erect, ± curled), seldom glabrate, resin-gland-dotted, adaxially scabrellous, glabrescent, not 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 | 3–35 mm. |
1–8(–12+) mm. |
Involucres | broadly campanulate to urceolate, (6–)7–10+ × 5–9+ mm. |
± campanulate, 5–7(–8+) × 4–6 mm. |
Florets | 30–55+. |
12–25+. |
Phyllaries | 50–70+ in 6–7 series, sparsely scabrellous, glabrescent (seldom resin-gland-dotted), margins ciliolate, the outer lanceolate, 1–2 mm, inner linear-oblong to oblong, 6–7(–9+) mm, tips acute or rounded-apiculate. |
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-scorpioid arrays. |
in congested, corymbiform arrays. |
Cypselae | 3.5–4; pappi stramineous to whitish, outer scales 25–30, 0.5–1.1 mm, contrasting with 35–40+, 6–8+ 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 missurica |
Vernonia fasciculata |
|
Phenology | Flowering Jul–Sep. | Flowering Jul–Sep. |
Habitat | Prairies, loamy to sandy soils | Bottomlands, ditches, low prairies |
Elevation | 30–200 m (100–700 ft) | 100–1200 m (300–3900 ft) |
Distribution |
AL; AR; GA; IA; IL; IN; KS; KY; LA; MI; MO; MS; OK; TN; TX
|
CO; IA; IL; IN; KS; KY; MA; MN; MO; ND; NE; OH; OK; SD; WI; MB
|
Source | FNA vol. 19, p. 212. | 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 | Rafinesque: Herb. Raf., 28. (1833) | Michaux: Fl. Bor.-Amer. 2: 94. (1803) |
Web links |