Flora of North America species comparison

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Iva angustifolia

narrowleaf marsh elder, narrowleaf sumpweed, Texas Marsh elder
Habit 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.
Peduncles

0–1 mm.
Involucres

± prismatically turbinate, 2.5–3 mm.
Pistillate florets

0–2+;

corollas 0.3–0.8+ mm.
Phyllaries

outer 3–5 ± connate, ± herbaceous.
Heads

in ± spiciform arrays.
Cypselae

2–3 mm.
Paleae

linear, 1.5–2 mm.
Functionally

staminate florets 2–5+;

corollas 1.5–2 mm.
2n

= 32.

Iva angustifolia
Phenology Flowering Sep–Nov.
Habitat Disturbed sites, moist soils
Elevation 0–300 m (0–1000 ft)
Distribution
from FNA
AR; FL; KS; LA; OK; TX
[WildflowerSearch map]
Source FNA vol. 21, p. 27.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Ambrosiinae > Iva
Sibling taxa
I. annua, I. axillaris, I. frutescens, I. hayesiana, I. imbricata, I. microcephala
Synonyms I. angustifolia var. latior, I. texensis
Name authority Nuttall ex de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 529. (1836)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Fabaceae, Apiaceae, Boraginaceae, and Polemoniaceae.)

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