The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links

stemless ironweed

Habit Plants 4–6(–10) dm.
Stems

± puberulent, glabrescent.

Leaves

mostly basal;

blades oblong-elliptic to spatulate (basal, the distal narrower), 11–25(–30) cm × (21–)60–75+ mm, l/w = 2–4(–5+), abaxially usually glabrous or glabrate, sometimes hirsutulous on veins, usually resin-gland-dotted, adaxially ± scabrellous or glabrate.

Peduncles

5–50 mm.

Heads

in loose, corymbiform arrays.

Involucres

campanulate to hemispheric, 5–10 × 6–7 mm.

Florets

30–40(–55+).

Phyllaries

40–60 in 5–6 series, glabrate, margins ciliolate, the outer lance-linear, 2–4 mm, inner lance-ovate to lance-subulate, 5–9 mm, tips subulate to filiform.

Cypselae

2.5–3+ mm;

pappi whitish to stramineous, outer scales ca. 20, 0.6–1 mm, contrasting with 25–40, 5–7+ mm inner bristles.

2n

= 34.

Vernonia acaulis

Phenology Flowering Jul–Aug.
Habitat Open woods, pine savannas, bogs, disturbed places
Elevation 10–300 m [0–1000 ft]
Distribution
from FNA
FL; GA; NC; SC
[WildflowerSearch map]
[BONAP county map]
Parent taxa Asteraceae > tribe Vernonieae > Vernonia
Sibling taxa
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. texana
Synonyms Chrysocoma acaulis
Name authority (Walter) Gleason: Bull. New York Bot. Gard. 4: 222. (1906)
Source Flora of North America vol. 19, p. 208.
Web links