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stemless ironweed

Georgia ironweed

Habit Plants 4–6(–10) dm. Plants 4–7+ dm.
Stems

± puberulent, glabrescent.

sparsely appressed-puberulent.

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.

mostly cauline;

blades (mid stem) mostly oblanceolate to lance-linear, rarely ovate, 3–7 cm × (5–)10–20+ mm, l/w = (2.5–)3.5–6+ (bases rounded-truncate), abaxially scabrellous (hairs awl-shaped), resin-gland-dotted, adaxially scabrellous.

Peduncles

5–50 mm.

5–35 mm.

Involucres

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

± campanulate, 6–11 × 5–9 mm.

Florets

30–40(–55+).

14–25(–30+).

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.

40–50+ in 5–6 series, sparsely puberulent, margins arachno-ciliate, the outer subulate to filiform, 3–7 mm, inner lance-attenuate to filiform, 9–10+ mm, tips subulate to filiform.

Heads

in loose, corymbiform arrays.

in ± corymbiform to paniculiform arrays.

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.

3–3.5 mm;

pappi stramineous, outer scales 25–30, 0.6–1.1 mm, contrasting with 30+, 6–7+ mm inner bristles.

2n

= 34.

= 34.

Vernonia acaulis

Vernonia pulchella

Phenology Flowering Jul–Aug. Flowering Jul–Sep.
Habitat Open woods, pine savannas, bogs, disturbed places Low, wet places in pine woods
Elevation 10–300 m (0–1000 ft) 20–50 m (100–200 ft)
Distribution
from FNA
FL; GA; NC; SC
[WildflowerSearch map]
[BONAP county map]
from FNA
GA; SC
[BONAP county map]
Source FNA vol. 19, p. 208. FNA vol. 19, p. 209.
Parent taxa Asteraceae > tribe Vernonieae > Vernonia 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
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. texana
Synonyms Chrysocoma acaulis
Name authority (Walter) Gleason: Bull. New York Bot. Gard. 4: 222. (1906) Small: Bull. Torrey Bot. Club 25: 145. (1898)
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