Flora of North America species comparison

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Vernonia arkansana

Vernonia marginata

Arkansas ironweed, great ironweed

ironplant, plains ironweed
Habit Plants 8–12(–20) dm. Plants 3–5(–8+) dm.
Stems

scabrellous to pilosulous, glabrescent.

puberulent, 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.

mostly cauline;

blades narrowly lanceolate to lance-linear, 5–15+ cm × (2.5–)8–12+ mm, l/w = 8–20(–30+), abaxially glabrate (pitted, awl-shaped hairs in pits), adaxially puberulent, glabrescent (sometimes pitted).
Peduncles

2–5 cm.

(3–)10–35 mm.
Involucres

± hemispheric, 11–15 × 11–15 mm.

narrowly campanulate, (7–)9–11 × 5–6 mm.
Florets

50–100+.

10–25+.
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.

35–40+ in 5–6+ series, glabrescent, margins arachno-ciliolate, the outer lance-ovate, 1–2 mm, inner oblong to linear-oblong, 6–9+ mm, tips ± acuminate.
Heads

in ± corymbiform arrays.

in corymbiform arrays.
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.

4–5 mm;

pappi stramineous to purplish, outer subulate scales or bristles 30+, 0.6–2+ mm, intergrading with 40+, 8–9+ mm inner subulate scales or bristles.
2n

= 34.

= 34.

Vernonia arkansana

Vernonia marginata
Phenology Flowering Aug–Oct. Flowering Jul–Aug.
Habitat Leas, roadsides, stream banks, in sand or on limestone Ditches, sandy flats, stream banks
Elevation 200–300 m (700–1000 ft) 600–2000 m (2000–6600 ft)
Distribution
from FNA
AR; KS; MO; OK
[WildflowerSearch map]
[BONAP county map]
from FNA
CO; KS; NM; OK; TX; Mexico (Coahuila)
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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. 208. FNA vol. 19, p. 211.
Parent taxa Asteraceae > tribe Vernonieae > Vernonia 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
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. missurica, V. noveboracensis, V. pulchella, V. texana
Synonyms V. crinita V. altissima var. marginata
Name authority de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 7: 264. (1838) (Torrey) Rafinesque: Atlantic J. 1: 146. (1832)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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