Flora of North America species comparison

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Ageratina rothrockii

Ageratina wrightii

Rothrock's snakeroot

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

ascending to erect, puberulent to glabrate.

erect, puberulous.
Leaves

opposite;

petioles 2–20 mm;

blades (3–5-nerved) lanceolate to lanceolate-ovate, mostly 3–6 × (1.5–)2–3 cm, bases obtuse to truncate, margins serrate to crenate, apices acute to acuminate, sparsely puberulent abaxially, mostly along nerves.

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

5–12(–20) mm, puberulent.

1–3 mm, puberulent.
Involucres

5–7 mm.

3.5–4.5 mm.
Corollas

white, lobes short-villous.

pinkish white to pink, glabrous.
Phyllaries

apices acute, abaxial faces glabrous or glabrescent, eglandular.

apices acute, abaxial faces puberulent.
Heads

clustered.

clustered.
Cypselae

sparsely and finely strigose-hirsute.

sparsely hispidulous.
Powell

on label].

2n

= 85 [ca. 100, fide A. M.

Ageratina rothrockii

Ageratina wrightii
Phenology Flowering (Jul–)Aug–Oct. Flowering (Jul–)Aug–Oct(–Nov).
Habitat Rocky slopes and ledges, in oak-juniper, pine-oak, pine, aspen, and spruce-fir woodland Limestone slopes, ledges, alluvium, in brushy vegetation
Elevation 1700–2400 m (5600–7900 ft) 1300–2200 m (4300–7200 ft)
Distribution
from FNA
AZ; NM; TX; Mexico (Chihuahua, Coahuila, Durango, Sonora)
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; NM; TX; Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Ageratina rothrockii is similar to A. altissima, probably its western vicariant, and the two perhaps would be justifiably treated as conspecific.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 550. 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. lemmonii, A. luciae-brauniae, A. occidentalis, A. paupercula, 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 rothrockii Eupatorium wrightii
Name authority (A. Gray) R. M. King & H. Robinson: Phytologia 19: 216. (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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