Flora of North America species comparison

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Ageratina adenophora

Ageratina lemmonii

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

Lemmon's snakeroot
Habit Subshrubs, 50–220 cm. Perennials, 20–40(–70) cm (densely fibrous-rooted crowns).
Stems

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

(commonly purple) erect, puberulous (hairs usually with colored crosswalls).
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 usually 0, sometimes 1–2 mm;

blades ovate-lanceolate, 2–4.5 × 0.5–2.5 cm, margins shallowly serrate, abaxial faces glabrous or glabrate, gland-dotted.
Peduncles

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

10–60 mm, puberulent.
Involucres

3.5–4 mm.

4–5.5 mm.
Corollas

white, pink-tinged, lobes sparsely hispidulous.

white, lobes densely hispid-villous.
Phyllaries

apices acute, abaxial faces stipitate-glandular.

(narrowly oblong-lanceolate) apices acute, abaxial faces sparsely hairy to glabrate.
Heads

clustered.

in loose, open arrays.
Cypselae

glabrous.

sparsely and finely hispidulous.
2n

= 51.

= 34.

Ageratina adenophora

Ageratina lemmonii
Phenology Flowering Mar–Aug(–Sep). Flowering Aug–Oct.
Habitat Stream margins, ditches, road embankments, hillsides Rocky slopes, mostly in pine-oak woodlands
Elevation 400–900 m (1300–3000 ft) 1800–2800[–3300, Mexico] m (5900–9200[–10800, Mexico] ft)
Distribution
from FNA
CA; Mexico; Intoduced [Also introduced in Europe, Pacific Islands (New Zealand)]
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; Mexico
[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. jucunda, A. luciae-brauniae, A. occidentalis, A. paupercula, A. rothrockii, A. shastensis, A. thyrsiflora, A. wrightii
Synonyms Eupatorium adenophorum Eupatorium lemmonii
Name authority (Sprengel) R. M. King & H. Robinson: Phytologia 19: 211. (1970) (B. L. Robinson) R. M. King & H. Robinson: Phytologia 19: 223. (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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