Flora of North America species comparison

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Vernonia arkansana

Vernonia larseniae

Arkansas ironweed, great ironweed

Larsen's ironweed
Habit Plants 8–12(–20) dm. Plants 7–10+ dm.
Stems

scabrellous to pilosulous, glabrescent.

tomentose to pannose.
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 linear, 5–9(–12+) cm × 3–5(–8+) mm, l/w = 16–32, abaxially tomentose, adaxially densely sericeo-tomentose.
Peduncles

2–5 cm.

10–60 mm.
Involucres

± hemispheric, 11–15 × 11–15 mm.

± hemispheric, 8–12 × 7–12 mm.
Florets

50–100+.

40–50+.
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.

50–60+ in 5–6+ series, sericeo-tomentose to pannose, including margins, the outer lance-deltate, 1–3 mm, the inner lanceolate, 7–11+ mm, tips acute.
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.

3.5–4+ mm;

pappi stramineous, outer subulate scales or bristles 20+, 0.6–1.5+ mm, intergrading with 30+, 6–7+ mm inner subulate scales or bristles.
2n

= 34.

= 34.

Vernonia arkansana

Vernonia larseniae
Phenology Flowering Aug–Oct. Flowering Jun.
Habitat Leas, roadsides, stream banks, in sand or on limestone Arroyos, on limestone
Elevation 200–300 m (700–1000 ft) 800–900 m (2600–3000 ft)
Distribution
from FNA
AR; KS; MO; OK
[WildflowerSearch map]
[BONAP county map]
from FNA
TX; Mexico (Coahuila)
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. 210.
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. lettermannii, V. lindheimeri, V. marginata, V. missurica, V. noveboracensis, V. pulchella, V. texana
Synonyms V. crinita V. lindheimeri var. leucophylla
Name authority de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 7: 264. (1838) B. L. King & S. B. Jones: Brittonia 27: 84. (1975)
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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