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woolly ironweed

stemless ironweed

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

± pannose.

± puberulent, glabrescent.

Leaves

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.

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

5–35 mm.

5–50 mm.

Involucres

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

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

Florets

12–24+.

30–40(–55+).

Phyllaries

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.

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.

Heads

in corymbiform arrays.

in loose, corymbiform arrays.

Cypselae

3–4 mm;

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

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.

= 34.

Vernonia lindheimeri

Vernonia acaulis

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