Flora of North America species comparison

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Eupatorium serotinum

late eupatorium, late thoroughwort, lateflowering thoroughwort
Habit Perennials, 50–150+ cm.
Stems

(from short caudices) single, sparsely to densely branched distally, pubescent throughout (sometimes reddish to purplish).
Leaves

opposite; petiolate (petioles 10–25 mm);

blades ± 3-nerved, lanceolate, 20–90+ × 5–40 mm, bases rounded to slightly oblique, margins entire or serrate, apices acute, faces puberulent, gland-dotted.
Florets

9–15;

corollas 2.5–3 mm.
Phyllaries

8–12 in 1–2 series, elliptic to oblong, 1–3 × 0.5–1 mm, apices slightly rounded to acute, abaxial faces puberulent, gland-dotted.
Heads

in corymbiform arrays.
Cypselae

1–1.5 mm;

pappi of 20–30 bristles 2–2.5 mm.
2n

= 20.

Eupatorium serotinum
Phenology Flowering Aug–Oct.
Habitat Moist or dry, open sites, roadsides
Elevation 10–400+ m (0–1300+ ft)
Distribution
from FNA
AL; AR; CT; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; MI; MN; MO; MS; NC; NE; NJ; NY; OH; OK; PA; RI; SC; TN; TX; VA; WI; WV
[WildflowerSearch map]
[BONAP county map]
Discussion

Eupatorium serotinum has a wide distribution and is often abundant where it occurs. It includes only sexual, diploid populations. It is known to hybridize with E. perfoliatum. An introduction of E. serotinum in southeastern Ontario apparently is local and may not have persisted.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 473.
Parent taxa Asteraceae > tribe Eupatorieae > Eupatorium
Sibling taxa
E. album, E. altissimum, E. anomalum, E. cannabinum, E. capillifolium, E. compositifolium, E. godfreyanum, E. hyssopifolium, E. lancifolium, E. leptophyllum, E. leucolepis, E. linearifolium, E. mikanioides, E. mohrii, E. perfoliatum, E. petaloideum, E. pilosum, E. resinosum, E. rotundifolium, E. semiserratum, E. sessilifolium, E. ×cordigerum, E. ×pinnatifidum
Name authority Michaux: Fl. Bor.-Amer. 2: 100. (1803)
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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