Flora of North America species comparison

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Ageratina lemmonii

Ageratina paupercula

Lemmon's snakeroot

Santa Rita snakeroot
Habit Perennials, 20–40(–70) cm (densely fibrous-rooted crowns). Perennials or subshrubs, to 100 cm.
Stems

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

erect, puberulent to glabrate.
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;

petioles 3–15 mm;

blades narrowly to broadly lanceolate, (2–)3–7 × 0.5–1.5 cm, margins coarsely and remotely serrate, apices long-acuminate, abaxial faces sparsely pubescent.
Peduncles

10–60 mm, puberulent.

2–6 mm, puberulent.
Involucres

4–5.5 mm.

2.5–3 mm.
Corollas

white, lobes densely hispid-villous.

white, lobes sparsely hispid-villous.
Phyllaries

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

apices acute, abaxial faces puberulent-hispidulous.
Heads

in loose, open arrays.

clustered.
Cypselae

sparsely and finely hispidulous.

glabrous.
2n

= 34.

Ageratina lemmonii

Ageratina paupercula
Phenology Flowering Aug–Oct. Flowering Mar–May.
Habitat Rocky slopes, mostly in pine-oak woodlands Rocky slopes, crevices, gravelly, sandy streambeds, pine-oak woodlands
Elevation 1800–2800[–3300, Mexico] m (5900–9200[–10800, Mexico] ft) 1000–1800 m (3300–5900 ft)
Distribution
from FNA
AZ; Mexico
[BONAP county map]
from FNA
AZ; Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Ageratina paupercula is recognized by its early spring flowering, relatively small and usually narrowly lanceolate and acuminate leaves, relatively small heads in clusters, and relatively small (1.2–1.4 mm versus mostly 2–3 mm in other species), glabrous cypselae.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 551. FNA vol. 21, p. 551.
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. rothrockii, A. shastensis, A. thyrsiflora, A. wrightii
Synonyms Eupatorium lemmonii Eupatorium pauperculum
Name authority (B. L. Robinson) R. M. King & H. Robinson: Phytologia 19: 223. (1970) (A. Gray) R. M. King & H. Robinson: Phytologia 19: 215. (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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