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Narrowleaf Ironweed

Vernonia lettermannii Engelm. ex A. Gray

Description

provided by eFloras
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. 2n = 34.
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 19: 208, 211 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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Vernonia lettermannii

provided by wikipedia EN

Vernonia lettermannii, the narrowleaf ironweed,[2] is a plant species known only from Arkansas and Oklahoma. It grows on floodplains and terraces at elevations of 100–200 m (330–660 ft).[3]

Vernonia lettermannii is a perennial herb up to 60 cm (24 in) tall. Leaves are filiform (thread-shaped), up to 9 cm (3.5 in) long but less than 3 mm (0.12 in) wide. Flower heads are purple, arranged as a corymb.[4][5][6]

References

  1. ^ Tropicos
  2. ^ "Vernonia lettermannii". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 29 July 2015.
  3. ^ Flora of North America
  4. ^ Gray, Asa. Notes on Some Compositae 78. 1880.
  5. ^ Robinson, H. 1999. Generic and subtribal classification of American Vernonieae. Smithsonian Contributions in Botany 89: i–iii, 1–116.
  6. ^ Cronquist, A.J. 1980. Asteraceae. 1: i–xv, 1–261. In Vascular Flora of the Southeastern United States. The University of North Carolina Press, Chapel Hill.
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Vernonia lettermannii: Brief Summary

provided by wikipedia EN

Vernonia lettermannii, the narrowleaf ironweed, is a plant species known only from Arkansas and Oklahoma. It grows on floodplains and terraces at elevations of 100–200 m (330–660 ft).

Vernonia lettermannii is a perennial herb up to 60 cm (24 in) tall. Leaves are filiform (thread-shaped), up to 9 cm (3.5 in) long but less than 3 mm (0.12 in) wide. Flower heads are purple, arranged as a corymb.

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