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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
from FNA
AL; AR; GA; IA; IL; IN; KS; KY; LA; MI; MO; MS; OK; TN; TX
[WildflowerSearch map]
[BONAP county map]
from FNA
CO; IA; IL; IN; KS; KY; MA; MN; MO; ND; NE; OH; OK; SD; WI; MB
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 19, p. 212. FNA vol. 19, p. 211.
Parent taxa Asteraceae > tribe Vernonieae > Vernonia Asteraceae > tribe Vernonieae > Vernonia
Sibling taxa
V. acaulis, V. angustifolia, V. arkansana, V. baldwinii, V. blodgettii, V. fasciculata, V. flaccidifolia, V. gigantea, V. glauca, V. larseniae, V. lettermannii, V. lindheimeri, V. marginata, V. noveboracensis, V. pulchella, V. texana
V. acaulis, V. angustifolia, V. arkansana, V. baldwinii, V. blodgettii, V. flaccidifolia, V. gigantea, V. glauca, V. larseniae, V. lettermannii, V. lindheimeri, V. marginata, V. missurica, V. noveboracensis, V. pulchella, V. texana
Synonyms V. fasciculata subsp. corymbosa, V. fasciculata var. corymbosa
Name authority Rafinesque: Herb. Raf., 28. (1833) Michaux: Fl. Bor.-Amer. 2: 94. (1803)
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