Flora of North America species comparison

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Parthenium confertum

gray feverfew, Gray's feverfew
Habit Biennials (sometimes flowering first year or persisting), 10–30(–60+) cm.
Leaf

blades ovate or rounded-deltate to elliptic, 30–80(–120+) × 10–20(–40+) mm, usually ± pinnately or sub-bipinnately lobed, ultimate margins entire, faces strigillose, usually also with erect hairs 1–2 mm and gland-dotted.
Peduncles

2–8(–12+) mm.
Pistillate florets

5;

corolla laminae 0 or ± coroniform, 0.1–0.5 mm.
Disc florets

20–30+.
Phyllaries

outer 5 lance-ovate to elliptic, 2.5–3+ mm, inner 5 ± orbiculate, 3–3.5 mm.
Heads

disciform or obscurely radiate, borne in open, ± paniculiform arrays.
Cypselae

± obovoid, 2–3 mm; pappus-like enations 2, ± erect, deltate to ovate, 0.5–1 mm (sometimes a third, subulate spur near apex adaxially).
2n

= 36, 68, 72.

Parthenium confertum
Phenology Flowering Mar–Oct.
Habitat Sandy plains, openings in mesquite grasslands
Elevation 20–2000 m (100–6600 ft)
Distribution
from FNA
AZ; NM; TX; Mexico
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 22.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Ambrosiinae > Parthenium
Sibling taxa
P. alpinum, P. argentatum, P. hysterophorus, P. incanum, P. integrifolium, P. ligulatum
Synonyms P. confertum var. divaricatum, P. confertum var. lyratum, P. confertum var. microcephalum
Name authority A. Gray: Proc. Amer. Acad. Arts 17: 216. (1882)
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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