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Iva angustifolia
Nutt. ex DC.
Family:
Asteraceae
Paul Rothrock
FNA
Resources
John L. Strother in Flora of North America (vol. 21)
Annuals
(rarely persisting), 20-60(-100+) cm.
Stems
usually erect.
Leaves:
petioles 0-2 mm; blades lance-linear to linear, 12-25(-45) × 1-4(-7+) mm, margins entire, faces scabrellous to hispidulous, gland-dotted.
Heads
in ± spiciform arrays.
Peduncles
0-1 mm.
Involucres
± prismatically turbinate, 2.5-3 mm.
Phyllaries:
outer 3-5 ± connate, ± herbaceous.
Paleae
linear, 1.5-2 mm.
Pistillate florets
0-2+; corollas 0.3-0.8+ mm.
Functionally staminate florets
2-5+; corollas 1.5-2 mm.
Cypselae
2-3 mm.
2
n
= 32.
Flowering Sep-Nov. Disturbed sites, moist soils; 0-300 m; Ark, Fla., Kans., La., Okla., Tex.
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Paul Rothrock
University of Florida Herbarium
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