Flora of North America species comparison

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Iva annua

annual marsh elder, rough marsh-elder, seacoast sumpweed
Habit Annuals, (10–)50–100(–150+) cm.
Stems

erect.
Leaves

petioles 5–20(–30) mm;

blades deltate or ovate to elliptic, trullate, or lanceolate, 30–100(–150)+ × 8–45(–80) mm, margins ± toothed, faces ± scabrellous, gland-dotted.
Peduncles

0–1 mm.
Involucres

± hemispheric, 3–4(–5) mm.
Pistillate florets

3–5;

corollas 0.5–1 mm.
Phyllaries

outer 3–5 distinct, ± herbaceous.
Heads

in ± spiciform arrays.
Cypselae

2–3 mm.
Paleae

linear, 2–2.5 mm.
Functionally

staminate florets 8–12+;

corollas 2–2.5 mm.
2n

= 34.

Iva annua
Phenology Flowering Jul–Nov.
Habitat Disturbed sites, moist soils
Elevation 10–500 m (0–1600 ft)
Distribution
from FNA
AL; AR; CO; FL; GA; IA; IL; IN; KS; KY; LA; MA; ME; MI; MO; MS; NC; ND; NE; NM; OH; OK; PA; SC; SD; TN; TX; VA; WI; WV; Mexico (Tamaulipas)
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 27.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Ambrosiinae > Iva
Sibling taxa
I. angustifolia, I. axillaris, I. frutescens, I. hayesiana, I. imbricata, I. microcephala
Synonyms I. annua var. caudata, I. annua var. macrocarpa
Name authority Linnaeus: Sp. Pl. 2: 988. (1753)
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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