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Vernonia marginata
(Torr.) Rafin.
No occurrences found
(redirected from:
Vernonia marginata var. tenuifolia
(Small) Shinners)
Family:
Asteraceae
plains ironweed
[
Vernonia marginata var. tenuifolia
(Small) Shinners]
Arizona State University Herbarium
FNA
Resources
John L. Strother in Flora of North America (vol. 19, 20 and 21)
Plants
3-5(-8+) dm.
Stems
puberulent, glabrescent.
Leaves
mostly cauline; blades narrowly lanceolate to lance-linear, 5-15+ cm × (2.5-)8-12+ mm, l/w = 8-20(-30+), abaxially glabrate (pitted, awl-shaped hairs in pits), adaxially puberulent, glabrescent (sometimes pitted).
Heads
in corymbiform arrays.
Peduncles
(3-)10-35 mm.
Involucres
narrowly campanulate, (7-)9-11 × 5-6 mm.
Phyllaries
35-40+ in 5-6+ series, glabrescent, margins arachno-ciliolate, the outer lance-ovate, 1-2 mm, inner oblong to linear-oblong, 6-9+ mm, tips ± acuminate.
Florets
10-25+.
Cypselae
4-5 mm;
pappi
stramineous to purplish, outer subulate scales or bristles 30+, 0.6-2+ mm, intergrading with 40+, 8-9+ mm inner subulate scales or bristles.
2
n
= 34. Flowering Jul-Aug. Ditches, sandy flats, stream banks; 600-2000 m; Colo., Kans., N.Mex., Okla., Tex.; Mexico (Coahuila).
Arizona State University Herbarium
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2 Total Images