Flora of North America species comparison

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Ageratina lemmonii

Ageratina wrightii

Lemmon's snakeroot

Wright's snakeroot
Habit Perennials, 20–40(–70) cm (densely fibrous-rooted crowns). Shrubs, 50–150 cm.
Stems

(commonly purple) erect, puberulous (hairs usually with colored crosswalls).

erect, puberulous.
Leaves

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.

opposite proximally, alternate on distal 1/3–1/2 of stem;

petioles narrowly winged, 3–5(–8) mm;

blades ovate to deltate-ovate, mostly 1–2 × 0.5–1.5(–2) cm, bases truncate to cuneate or attenuate, margins entire or shallowly crenate, apices acute to blunt or obtuse, abaxial faces gland-dotted.
Peduncles

10–60 mm, puberulent.

1–3 mm, puberulent.
Involucres

4–5.5 mm.

3.5–4.5 mm.
Corollas

white, lobes densely hispid-villous.

pinkish white to pink, glabrous.
Phyllaries

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

apices acute, abaxial faces puberulent.
Heads

in loose, open arrays.

clustered.
Cypselae

sparsely and finely hispidulous.

sparsely hispidulous.
2n

= 34.

Ageratina lemmonii

Ageratina wrightii
Phenology Flowering Aug–Oct. Flowering (Jul–)Aug–Oct(–Nov).
Habitat Rocky slopes, mostly in pine-oak woodlands Limestone slopes, ledges, alluvium, in brushy vegetation
Elevation 1800–2800[–3300, Mexico] m (5900–9200[–10800, Mexico] ft) 1300–2200 m (4300–7200 ft)
Distribution
from FNA
AZ; Mexico
[BONAP county map]
from FNA
AZ; NM; TX; Mexico
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 551. FNA vol. 21, p. 552.
Parent taxa Asteraceae > tribe Eupatorieae > Ageratina Asteraceae > tribe Eupatorieae > Ageratina
Sibling taxa
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
A. adenophora, 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
Synonyms Eupatorium lemmonii Eupatorium wrightii
Name authority (B. L. Robinson) R. M. King & H. Robinson: Phytologia 19: 223. (1970) (A. Gray) R. M. King & H. Robinson: Phytologia 19: 228. (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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