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American feverfew, wild feverfew, wild quinine

Habit Perennials, 30–60(–100+) cm.
Leaf

blades ovate to lanceolate, 30–350+ × 20–120+ mm, margins usually crenate to serrate, sometimes coarsely toothed or somewhat lobed (then mostly toward bases), faces hispid to hirtellous or ± scabrous, gland-dotted.

Peduncles

1–8(–12+) mm.

Pistillate florets

5(–6);

corolla laminae ovate to oblong or orbiculate, 1–2+ mm.

Disc florets

15–35+.

Phyllaries

outer 5(–6) lanceolate to broadly ovate, 3–5 mm, inner 5(–6) ± orbiculate, 4–6 mm.

Heads

radiate, borne in corymbiform to paniculiform arrays.

Cypselae

± obovoid, 3–4+ mm; pappus-like enations 0 or 2(–4), erect to spreading, ± subulate or threadlike, fragile, 0.3–0.6+ mm.

2n

= 72.

Parthenium integrifolium

Phenology Flowering May–Sep.
Habitat Glades and barrens, prairies, disturbed sites
Elevation 10–500 m (0–1600 ft)
Distribution
from FNA
AL; AR; CT; GA; IA; IL; IN; KS; KY; LA; MA; MI; MN; MO; MS; NC; NY; OH; OK; PA; SC; TN; TX; VA; WI; WV
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[BONAP county map]
Discussion

As evidenced by the synonymy, Parthenium integrifolium as here circumscribed has been variously partitioned by other taxonomists. For the present, I see no justification for segregating species from, or for formal recognition of infraspecific taxa within P. integrifolium.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 21, p. 22.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Ambrosiinae > Parthenium
Sibling taxa
P. alpinum, P. argentatum, P. confertum, P. hysterophorus, P. incanum, P. ligulatum
Synonyms P. auriculatum, P. hispidum, P. hispidum var. auriculatum, P. integrifolium var. auriculatum, P. integrifolium var. henryanum, P. integrifolium var. hispidum, P. integrifolium var. mabryanum, P. radfordii
Name authority Linnaeus: Sp. Pl. 2: 988. (1753)
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