Flora of North America species comparison

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Ageratina jucunda

Ageratina herbacea

hammock snakeroot, lesser snakeroot

desert ageratina, fragrant snakeroot, white thoroughwort
Habit Perennials, 40–80(–100) cm. Perennials or subshrubs, (20–)30–60(–80) cm (woody crowns and woody rhizomes).
Stems

erect, lax, minutely pilose.

erect (brittle), minutely puberulent.
Leaves

opposite;

petioles 7–15(–22) mm;

blades narrowly deltate to rhombic, 2–6(–7) × 1.5–4 cm, (usually subcoriaceous) bases usually cuneate, sometimes truncate to slightly subcordate, margins usually coarsely serrate or incised, sometimes crenate to subentire, apices acute to acuminate, abaxial faces glabrous or hairy on veins.

opposite;

petioles 10–25 mm;

blades triangular to lanceolate-ovate or ovate, 2–5(–7) × 1.5–3.5(–4.5) cm, bases truncate to shallowly cordate, margins dentate to serrate-dentate, abaxial faces sparsely hispidulous to glabrate, eglandular.
Peduncles

2–10 mm, sparsely puberulent.

4–15 mm, puberulent.
Involucres

2.5–4 mm.

4–5 mm.
Corollas

white, lobes glabrous or sparsely short-hirtellous.

white, glabrous.
Phyllaries

apices acute, abaxial faces puberulent to villous-puberulent.

apices acute, abaxial faces granular-puberulent.
Heads

clustered.

clustered.
Cypselae

usually finely hirtellous-strigose on distal 1/3, sometimes glabrous.

finely strigose-hispidulous.
2n

= 34.

= 34.

Ageratina jucunda

Ageratina herbacea
Phenology Flowering (Sep–)Oct–Dec(–Jan). Flowering (Jul–)Aug–Oct.
Habitat Sand pine scrub, longleaf pine-turkey oak sand ridges, pine-palmetto, live-oak woods, hammocks, dunes, roadsides, old fields, stream banks, dry flatwoods Pine, pine-oak, juniper, and pinyon-juniper woodlands, rocks along streams, slopes, ridges, washes
Elevation 0–50 m (0–200 ft) 1400–2700(–2900) m (4600–8900(–9500) ft)
Distribution
from FNA
FL; GA
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CA; CO; NM; NV; TX; UT; Mexico (Baja California, Chihuahua, Coahuila, Sonora)
[WildflowerSearch map]
[BONAP county map]
Discussion

Ageratina herbacea is recognized by the distinctive color of its usually yellow-green, sometimes grayish, leaves, granular-puberulent involucres (with minute, thickened, eglandular hairs), and woody rhizomes.

(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. 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. jucunda, A. lemmonii, A. luciae-brauniae, A. occidentalis, A. paupercula, A. rothrockii, A. shastensis, A. thyrsiflora, A. wrightii
Synonyms Eupatorium jucundum Eupatorium ageratifolium var. herbaceum, Eupatorium herbaceum
Name authority (Greene) Clewell & Wooten: Brittonia 23: 142. (1971) (A. Gray) R. M. King & H. Robinson: Phytologia 19: 222. (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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