Flora of North America species comparison

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Ageratina adenophora

Ageratina jucunda

Crofton weed, eupatory, Mexican devil, sticky snakeroot, thoroughwort

hammock snakeroot, lesser snakeroot
Habit Subshrubs, 50–220 cm. Perennials, 40–80(–100) cm.
Stems

(usually purplish when young) erect, stipitate-glandular.

erect, lax, minutely pilose.
Leaves

opposite;

petioles 10–25 mm;

blades (abaxially purple) ovate-lanceolate or ovate-deltate to lanceolate-ovate, (1.5–)2.5–5.5(–8) × 1.5–4(–6) cm, bases cuneate to obtuse or nearly truncate, margins serrate, apices acute to acuminate, abaxial faces stipitate- to sessile-glandular.

opposite;

petioles 7–15(–22) mm;

blades narrowly deltate to rhombic, 2–6(–7) × 1.5–4 cm, (usually subcoriaceous) bases usually cuneate, sometimes truncate to slightly subcordate, margins usually coarsely serrate or incised, sometimes crenate to subentire, apices acute to acuminate, abaxial faces glabrous or hairy on veins.
Peduncles

5–12 mm, densely stipitate-glandular and sometimes also sparsely viscid-puberulent.

2–10 mm, sparsely puberulent.
Involucres

3.5–4 mm.

2.5–4 mm.
Corollas

white, pink-tinged, lobes sparsely hispidulous.

white, lobes glabrous or sparsely short-hirtellous.
Phyllaries

apices acute, abaxial faces stipitate-glandular.

apices acute, abaxial faces puberulent to villous-puberulent.
Heads

clustered.

clustered.
Cypselae

glabrous.

usually finely hirtellous-strigose on distal 1/3, sometimes glabrous.
2n

= 51.

= 34.

Ageratina adenophora

Ageratina jucunda
Phenology Flowering Mar–Aug(–Sep). Flowering (Sep–)Oct–Dec(–Jan).
Habitat Stream margins, ditches, road embankments, hillsides Sand pine scrub, longleaf pine-turkey oak sand ridges, pine-palmetto, live-oak woods, hammocks, dunes, roadsides, old fields, stream banks, dry flatwoods
Elevation 400–900 m (1300–3000 ft) 0–50 m (0–200 ft)
Distribution
from FNA
CA; Mexico; Intoduced [Also introduced in Europe, Pacific Islands (New Zealand)]
[WildflowerSearch map]
[BONAP county map]
from FNA
FL; GA
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 553. FNA vol. 21, p. 551.
Parent taxa Asteraceae > tribe Eupatorieae > Ageratina Asteraceae > tribe Eupatorieae > Ageratina
Sibling taxa
A. altissima, A. aromatica, A. havanensis, A. herbacea, A. jucunda, A. lemmonii, A. luciae-brauniae, A. occidentalis, A. paupercula, A. rothrockii, A. shastensis, A. thyrsiflora, A. wrightii
A. adenophora, A. altissima, A. aromatica, A. havanensis, A. herbacea, A. lemmonii, A. luciae-brauniae, A. occidentalis, A. paupercula, A. rothrockii, A. shastensis, A. thyrsiflora, A. wrightii
Synonyms Eupatorium adenophorum Eupatorium jucundum
Name authority (Sprengel) R. M. King & H. Robinson: Phytologia 19: 211. (1970) (Greene) Clewell & Wooten: Brittonia 23: 142. (1971)
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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