Flora of North America species comparison

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Vernonia lettermannii

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

glabrous or glabrate.
Leaves

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

6–20+ mm.
Involucres

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

10–12+.
Phyllaries

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 corymbiform arrays.
Cypselae

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.

Vernonia lettermannii
Phenology Flowering Jul–Aug.
Habitat Flood plains, terraces
Elevation 100–200 m (300–700 ft)
Distribution
from FNA
AR; OK
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 19, p. 211.
Parent taxa 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. lindheimeri, V. marginata, V. missurica, V. noveboracensis, V. pulchella, V. texana
Name authority 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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