Flora of North America species comparison

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Ageratina paupercula

Santa Rita snakeroot
Habit Perennials or subshrubs, to 100 cm.
Stems

erect, puberulent to glabrate.
Leaves

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

2–6 mm, puberulent.
Involucres

2.5–3 mm.
Corollas

white, lobes sparsely hispid-villous.
Phyllaries

apices acute, abaxial faces puberulent-hispidulous.
Heads

clustered.
Cypselae

glabrous.

Ageratina paupercula
Phenology Flowering Mar–May.
Habitat Rocky slopes, crevices, gravelly, sandy streambeds, pine-oak woodlands
Elevation 1000–1800 m (3300–5900 ft)
Distribution
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.
Parent taxa 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. rothrockii, A. shastensis, A. thyrsiflora, A. wrightii
Synonyms Eupatorium pauperculum
Name authority (A. Gray) R. M. King & H. Robinson: Phytologia 19: 215. (1970)
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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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