Flora of North America species comparison

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Iva axillaris

death weed, deep-root, deer root, poverty-weed
Habit Perennials, 10–40(–60) cm (rhizomatous).
Stems

erect (usually herbaceous).
Leaves

petioles 0–3 mm;

blades narrowly ovate or obovate to elliptic or spatulate, 15–25(–45) × 3–8(–15) mm, margins rarely toothed, faces usually ± strigose to scabrellous, gland-dotted.
Peduncles

1–2 mm.
Involucres

± hemispheric, 2–3 mm.
Pistillate florets

3–5(–8);

corollas 0.5–1.5 mm.
Phyllaries

outer 3–5 ± connate, ± herbaceous.
Heads

in ± racemiform arrays.
Cypselae

2.5–3 mm.
Paleae

linear, 1.5–2 mm.
Functionally

staminate florets 4–8(–20+);

corollas 2–2.5 mm.
2n

= 36, 54.

Iva axillaris
Phenology Flowering May–Oct.
Habitat Seasonally wet, saline habitats
Elevation 10–2500 m (0–8200 ft)
Distribution
from FNA
AZ; CA; CO; ID; KS; MN; MT; ND; NE; NM; NV; OK; OR; SD; TX; UT; WA; WI; WY; AB; BC; MB; SK
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 26.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Ambrosiinae > Iva
Sibling taxa
I. angustifolia, I. annua, I. frutescens, I. hayesiana, I. imbricata, I. microcephala
Synonyms I. axillaris var. robustior
Name authority Pursh: Fl. Amer. Sept. 2: 743. (1813)
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.)

Choose a data source: Flora of North America, OregonFlora, UW Burke Herbarium

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