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Arkansas ironweed, great ironweed

Habit Plants 8–12(–20) dm.
Stems

scabrellous to pilosulous, glabrescent.

Leaves

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

2–5 cm.

Heads

in ± corymbiform arrays.

Involucres

± hemispheric, 11–15 × 11–15 mm.

Florets

50–100+.

Phyllaries

(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.

Cypselae

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.

Vernonia arkansana

Phenology Flowering Aug–Oct.
Habitat Leas, roadsides, stream banks, in sand or on limestone
Elevation 200–300 m [700–1000 ft]
Discussion

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

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

Distribution
from FNA
AR; KS; MO; OK
[WildflowerSearch map]
[BONAP county map]
Parent taxa Asteraceae > tribe Vernonieae > Vernonia
Sibling taxa
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 de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 7: 264. (1838)
Source Flora of North America vol. 19, p. 208.
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