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Missouri ironweed

Arkansas ironweed, great ironweed

Habit Plants 6–12(–20+) dm. Plants 8–12(–20) dm.
Stems

puberulent.

scabrellous to pilosulous, 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 lance-linear, 6–14(–20) cm × 7–15(–25) mm, l/w = 7–10(–18), abaxially scabrellous (hairs awl-shaped), resin-gland-dotted, adaxially scaberulous, glabrescent, resin-gland-dotted.

Peduncles

3–35 mm.

2–5 cm.

Involucres

broadly campanulate to urceolate, (6–)7–10+ × 5–9+ mm.

± hemispheric, 11–15 × 11–15 mm.

Florets

30–55+.

50–100+.

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.

(50–)60–70+ in 5–6 series, scabrellous (and resin-gland-dotted), margins ciliolate, the outer lance-ovate, 3–8+ mm, inner lanceolate, 12–15 mm, tips subulate to filiform.

Heads

in corymbiform-scorpioid arrays.

in ± 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 mm;

pappi fuscous to purplish, outer scales 25–30+, 0.5–1 mm, contrasting with 25–30+, 5–7 mm inner bristles.

2n

= 34.

= 34.

Vernonia missurica

Vernonia arkansana

Phenology Flowering Jul–Sep. Flowering Aug–Oct.
Habitat Prairies, loamy to sandy soils Leas, roadsides, stream banks, in sand or on limestone
Elevation 30–200 m (100–700 ft) 200–300 m (700–1000 ft)
Distribution
from FNA
AL; AR; GA; IA; IL; IN; KS; KY; LA; MI; MO; MS; OK; TN; TX
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from FNA
AR; KS; MO; OK
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[BONAP county map]
Discussion

Vernonia arkansana was published in April, V. crinita in October 1838.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 19, p. 212. FNA vol. 19, p. 208.
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. baldwinii, V. blodgettii, V. fasciculata, V. flaccidifolia, V. gigantea, V. glauca, V. larseniae, V. lettermannii, V. lindheimeri, V. marginata, V. missurica, V. noveboracensis, V. pulchella, V. texana
Synonyms V. crinita
Name authority Rafinesque: Herb. Raf., 28. (1833) de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 7: 264. (1838)
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