Flora of North America species comparison

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Eupatorium leptophyllum

false fennel
Habit Perennials, 50–200 cm.
Stems

(from short caudices) single, branched distally, glabrous throughout, gland-dotted.
Leaves

opposite (proximal) or alternate (nodes often appearing leafy by development of leaves on lateral buds without axis elongation); petiolate or sessile;

blades (usually pinnately or ternately lobed) or lobes 1-nerved or pinnately nerved, linear, 20–100 × 0.2–0.5(–1) mm, bases slightly expanded, margins entire, apices rounded to acute, faces sparsely puberulent to glabrate, gland-dotted.
Florets

5;

corollas 2–2.5 mm.
Phyllaries

6–10 in 1–2 series, lanceolate, 1.5–3 × 0.5–0.7 mm, apices acuminate, mucronate, abaxial faces glabrous or glabrate (not gland-dotted).
Heads

in paniculiform arrays (branches supporting heads recurved, secund).
Cypselae

1–1.5 mm;

pappi of 15–30 bristles 2–2.5 mm.
2n

= 20.

Eupatorium leptophyllum
Phenology Flowering Aug–Oct.
Habitat Pond margins, wet, low places, shallow water
Elevation 10–50+ m (0–200+ ft)
Distribution
from FNA
AL; FL; GA; MS; NC; SC
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 469.
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. leucolepis, E. linearifolium, E. mikanioides, E. mohrii, E. perfoliatum, E. petaloideum, E. pilosum, E. resinosum, E. rotundifolium, E. semiserratum, E. serotinum, E. sessilifolium, E. ×cordigerum, E. ×pinnatifidum
Synonyms E. capillifolium var. leptophyllum
Name authority de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 176. (1836)
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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