Flora of North America species comparison

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Parthenium incanum

mariola
Habit Shrubs, 30–100+ cm.
Leaf

blades oval-elliptic to obovate, 15–25(–40+) × 6–15(–25+) mm, sometimes pinnately (3–)5–7-lobed or round-toothed, ultimate margins entire, faces tomentose (gray to white) and gland-dotted.
Peduncles

1–3+ mm.
Pistillate florets

5;

corolla laminae ovate, 1–1.5 mm.
Disc florets

8–20(–30+).
Phyllaries

outer 5 oblong, 1.5–2 mm, inner 5 orbiculate, 2–2.5 mm.
Heads

radiate, in glomerules of 3–5+ on branched stalks 1–5(–12+) cm, forming compound, corymbiform arrays.
Cypselae

obovoid, 1.5–2 mm; pappus-like enations 2(–3), erect to spreading, ± subulate, 0.5–1 mm.
2n

= 54.

Parthenium incanum
Phenology Flowering (May–)Jul–Nov.
Habitat Openings in desert scrub, often on limestone soils
Elevation 1000–1500 m (3300–4900 ft)
Distribution
from FNA
AZ; NM; NV; TX; UT; Mexico
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 21.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Ambrosiinae > Parthenium
Sibling taxa
P. alpinum, P. argentatum, P. confertum, P. hysterophorus, P. integrifolium, P. ligulatum
Name authority Kunth: in A. von Humboldt et al., Nov. Gen. Sp. 4(fol.): 204. (1818)
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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