Flora of North America species comparison

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Vernonia texana

Vernonia lettermannii

Texas ironweed

narrowleaf ironweed, slimleaf ironweed
Habit Plants 4–8(–10+) dm. Plants (2–)5–6+ dm.
Stems

puberulent, glabrescent.

glabrous or glabrate.
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 filiform, 5–9+ cm × 1–3+ mm, l/w = 25–50+, abaxially glabrate (pitted, awl-shaped hairs in pits), adaxially puberulent, glabrescent (sometimes pitted).
Peduncles

1–35 mm.

6–20+ mm.
Involucres

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

narrowly campanulate, 7–9(–10+) × 4–5+ mm.
Florets

12–24+.

10–12+.
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.

30–40+ in 5–6+ series, sparsely tomentose, glabrescent, margins arachno-ciliolate, the outer lanceolate to subulate, 1–3 mm, inner oblong to lanceolate, 5–7+ mm, tips acute.
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.

3–4 mm;

pappi fuscous to purplish, outer scales 25+, 0.1–0.5 mm, contrasting with 35+, 6–7+ mm inner bristles.
2n

= 34.

= 34.

Vernonia texana

Vernonia lettermannii
Phenology Flowering Jun–Aug. Flowering Jul–Aug.
Habitat Pinelands, scrub oak woodlands, sandy or sandy-clay soils Flood plains, terraces
Elevation 60–200 m (200–700 ft) 100–200 m (300–700 ft)
Distribution
from FNA
AR; LA; MS; OK; TX
[WildflowerSearch map]
[BONAP county map]
from FNA
AR; OK
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 19, p. 211. FNA vol. 19, p. 211.
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. arkansana, V. baldwinii, V. blodgettii, V. fasciculata, V. flaccidifolia, V. gigantea, V. glauca, V. larseniae, V. lindheimeri, V. marginata, V. missurica, V. noveboracensis, V. pulchella, V. texana
Synonyms V. angustifolia var. texana
Name authority (A. Gray) Small: Fl. S.E. U.S., 1338. (1903) Engelmann ex A. Gray: Notes Compositae, 78. (1880)
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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