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Vernonia lettermannii
Engelm. ex A. Gray
Family:
Asteraceae
Narrow-Leaf Ironweed
Images
not available
FNA
Resources
John L. Strother in Flora of North America (vol. 19, 20 and 21)
Plants
(2-)5-6+ dm.
Stems
glabrous or glabrate.
Leaves
mostly cauline; blades filiform, 5-9+ cm × 1-3+ mm, l/w = 25-50+, abaxially glabrate (pitted, awl-shaped hairs in pits), adaxially puberulent, glabrescent (sometimes pitted).
Heads
in corymbi-form arrays.
Peduncles
6-20+ mm.
Involucres
narrowly campanulate, 7-9(-10+) × 4-5+ mm.
Phyllaries
30-40+ in 5-6+ series, sparsely tomentose, glabrescent, margins arachno-ciliolate, the outer lanceolate to subulate, 1-3 mm, inner oblong to lanceolate, 5-7+ mm, tips acute.
Florets
10-12+.
Cypselae
3-4 mm;
pappi
fuscous to purplish, outer scales 25+, 0.1-0.5 mm, contrasting with 35+, 6-7+ mm inner bristles.
2
n
= 34. Flowering Jul-Aug. Flood plains, terraces; 100-200 m; Ark., Okla.
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This project made possible through support from the UF Planning, Design & Construction and the UF Office of Sustainability
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