Flora of North America species comparison

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Vernonia marginata

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

puberulent, glabrescent.
Leaves

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

(3–)10–35 mm.
Involucres

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

10–25+.
Phyllaries

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.
Cypselae

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.

Vernonia marginata
Phenology Flowering Jul–Aug.
Habitat Ditches, sandy flats, stream banks
Elevation 600–2000 m (2000–6600 ft)
Distribution
from FNA
CO; KS; NM; OK; TX; Mexico (Coahuila)
[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. lettermannii, V. lindheimeri, V. missurica, V. noveboracensis, V. pulchella, V. texana
Synonyms V. altissima var. marginata
Name authority (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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(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Fabaceae, Apiaceae, Boraginaceae, and Polemoniaceae.)

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