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Missouri ironweed

stemless ironweed

Habit Plants 6–12(–20+) dm. Plants 4–6(–10) dm.
Stems

puberulent.

± puberulent, glabrescent.

Leaves

mostly cauline;

blades elliptic to lance-ovate or lanceolate, 6–16(–20+) cm × 18–48+ mm, l/w = 2.5–4(–6+), abaxially usually puberulent to tomentose or pannose (hairs ± erect, ± curled), seldom glabrate, resin-gland-dotted, adaxially scabrellous, glabrescent, not resin-gland-dotted.

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

3–35 mm.

5–50 mm.

Involucres

broadly campanulate to urceolate, (6–)7–10+ × 5–9+ mm.

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

Florets

30–55+.

30–40(–55+).

Phyllaries

50–70+ in 6–7 series, sparsely scabrellous, glabrescent (seldom resin-gland-dotted), margins ciliolate, the outer lanceolate, 1–2 mm, inner linear-oblong to oblong, 6–7(–9+) mm, tips acute or rounded-apiculate.

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-scorpioid arrays.

in loose, corymbiform arrays.

Cypselae

3.5–4;

pappi stramineous to whitish, outer scales 25–30, 0.5–1.1 mm, contrasting with 35–40+, 6–8+ 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 missurica

Vernonia acaulis

Phenology Flowering Jul–Sep. Flowering Jul–Aug.
Habitat Prairies, loamy to sandy soils Open woods, pine savannas, bogs, disturbed places
Elevation 30–200 m (100–700 ft) 10–300 m (0–1000 ft)
Distribution
from FNA
AL; AR; GA; IA; IL; IN; KS; KY; LA; MI; MO; MS; OK; TN; TX
[WildflowerSearch map]
[BONAP county map]
from FNA
FL; GA; NC; SC
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 19, p. 212. 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. lindheimeri, V. marginata, 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 Rafinesque: Herb. Raf., 28. (1833) (Walter) Gleason: Bull. New York Bot. Gard. 4: 222. (1906)
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