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woolly ironweed

Larsen's ironweed

Habit Plants 2–5(–8+) dm. Plants 7–10+ dm.
Stems

± pannose.

tomentose to pannose.

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 cauline;

blades linear, 5–9(–12+) cm × 3–5(–8+) mm, l/w = 16–32, abaxially tomentose, adaxially densely sericeo-tomentose.

Peduncles

5–35 mm.

10–60 mm.

Involucres

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

± hemispheric, 8–12 × 7–12 mm.

Florets

12–24+.

40–50+.

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.

50–60+ in 5–6+ series, sericeo-tomentose to pannose, including margins, the outer lance-deltate, 1–3 mm, the inner lanceolate, 7–11+ mm, tips acute.

Heads

in corymbiform arrays.

in 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.

3.5–4+ mm;

pappi stramineous, outer subulate scales or bristles 20+, 0.6–1.5+ mm, intergrading with 30+, 6–7+ mm inner subulate scales or bristles.

2n

= 34.

= 34.

Vernonia lindheimeri

Vernonia larseniae

Phenology Flowering Jun–Aug. Flowering Jun.
Habitat Calcareous soils, rocky banks Arroyos, on limestone
Elevation 300 m (1000 ft) 800–900 m (2600–3000 ft)
Distribution
from FNA
AR; TX; Mexico (Coahuila)
[WildflowerSearch map]
[BONAP county map]
from FNA
TX; Mexico (Coahuila)
Source FNA vol. 19, p. 210. FNA vol. 19, p. 210.
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. acaulis, V. angustifolia, V. arkansana, V. baldwinii, V. blodgettii, V. fasciculata, V. flaccidifolia, V. gigantea, V. glauca, V. lettermannii, V. lindheimeri, V. marginata, V. missurica, V. noveboracensis, V. pulchella, V. texana
Synonyms V. lindheimeri var. leucophylla
Name authority A. Gray & Engelmann: Proc. Amer. Acad. Arts 1: 46. (1847) B. L. King & S. B. Jones: Brittonia 27: 84. (1975)
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