Flora of North America species comparison

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Vernonia texana

Vernonia arkansana

Texas ironweed

Arkansas ironweed, great ironweed
Habit Plants 4–8(–10+) dm. Plants 8–12(–20) dm.
Stems

puberulent, glabrescent.

scabrellous to pilosulous, glabrescent.
Leaves

basal and cauline;

blades ovate-lanceolate (basal) to narrowly lanceolate (distal), 5–12+ cm × (5–)12–25+ mm, l/w = 3–5 (basal) or 8–17 (distal), abaxially glabrate (pitted, awl-shaped hairs in pits), adaxially puberulent and/or scabrellous.

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

1–35 mm.

2–5 cm.
Involucres

± obconic to hemispheric, 4.5–6 × 5–7 mm.

± hemispheric, 11–15 × 11–15 mm.
Florets

12–24+.

50–100+.
Phyllaries

35–45+ in 5–6+ series, glabrescent, margins arachno-ciliolate, the outer lance-deltate, 1–32 mm, inner oblong to linear, 4–5(–6) 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 open, paniculiform-scorpioid arrays.

in ± corymbiform arrays.
Cypselae

2–3 mm;

pappi usually whitish to stramineous (rarely purplish), outer scales or bristles 20+, 0.3–1+ mm, contrasting or intergrading with 20+, 6–7+ mm inner subulate scales or 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 texana

Vernonia arkansana
Phenology Flowering Jun–Aug. Flowering Aug–Oct.
Habitat Pinelands, scrub oak woodlands, sandy or sandy-clay soils Leas, roadsides, stream banks, in sand or on limestone
Elevation 60–200 m (200–700 ft) 200–300 m (700–1000 ft)
Distribution
from FNA
AR; LA; MS; OK; TX
[WildflowerSearch map]
[BONAP county map]
from FNA
AR; KS; MO; OK
[WildflowerSearch map]
[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. 211. 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. missurica, V. noveboracensis, V. pulchella
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. angustifolia var. texana V. crinita
Name authority (A. Gray) Small: Fl. S.E. U.S., 1338. (1903) de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 7: 264. (1838)
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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