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stemless ironweed

woolly ironweed

Habit Plants 4–6(–10) dm. Plants 2–5(–8+) dm.
Stems

± puberulent, glabrescent.

± pannose.

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 linear, 5–8 cm × 2–4 mm, l/w = 17–25(–40), abaxially densely sericeo-tomentose, adaxially usually glabrate, sometimes sparsely arachno-tomentose.

Peduncles

5–50 mm.

5–35 mm.

Involucres

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

± obconic to campanulate, 6–10 × 5–8 mm.

Florets

30–40(–55+).

12–24+.

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, sericeo-tomentose, including margins, the outer lance-ovate, 1–2 mm, the inner lanceolate to lance-linear, 6–7(–9+) mm, tips acute.

Heads

in loose, corymbiform arrays.

in corymbiform 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.

3–4 mm;

pappi stramineous to purplish, outer scales 20+, 0.6–1.1 mm, contrasting with 20+, 6–7+ mm inner bristles.

2n

= 34.

= 34.

Vernonia acaulis

Vernonia lindheimeri

Phenology Flowering Jul–Aug. Flowering Jun–Aug.
Habitat Open woods, pine savannas, bogs, disturbed places Calcareous soils, rocky banks
Elevation 10–300 m (0–1000 ft) 300 m (1000 ft)
Distribution
from FNA
FL; GA; NC; SC
[WildflowerSearch map]
[BONAP county map]
from FNA
AR; TX; Mexico (Coahuila)
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 19, p. 208. FNA vol. 19, p. 210.
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. marginata, V. missurica, V. noveboracensis, V. pulchella, V. texana
Synonyms Chrysocoma acaulis
Name authority (Walter) Gleason: Bull. New York Bot. Gard. 4: 222. (1906) A. Gray & Engelmann: Proc. Amer. Acad. Arts 1: 46. (1847)
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