Flora of North America species comparison

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Ageratina jucunda

Ageratina adenophora

hammock snakeroot, lesser snakeroot

Crofton weed, eupatory, Mexican devil, sticky snakeroot, thoroughwort
Habit Perennials, 40–80(–100) cm. Subshrubs, 50–220 cm.
Stems

erect, lax, minutely pilose.

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

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.

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.
Peduncles

2–10 mm, sparsely puberulent.

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

2.5–4 mm.

3.5–4 mm.
Corollas

white, lobes glabrous or sparsely short-hirtellous.

white, pink-tinged, lobes sparsely hispidulous.
Phyllaries

apices acute, abaxial faces puberulent to villous-puberulent.

apices acute, abaxial faces stipitate-glandular.
Heads

clustered.

clustered.
Cypselae

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

glabrous.
2n

= 34.

= 51.

Ageratina jucunda

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