Flora of North America species comparison

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Ageratina wrightii

Ageratina havanensis

Wright's snakeroot

Havana snakeroot, shrubby boneset, white mistflower, white shrub mistflower
Habit Shrubs, 50–150 cm. Shrubs [trees], (30–)69–150(–200) cm.
Stems

erect, puberulous.

erect (brittle), puberulent to glabrous.
Leaves

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.

persistent, opposite;

petioles 3–10(–15) mm;

blades deltate to broadly ovate or somewhat hastate, (2–)3–5(–8) × 2–5 cm, bases truncate to cuneate, margins dentate, apices acute, faces glabrous or nearly so, eglandular.
Peduncles

1–3 mm, puberulent.

2–14 mm, minutely puberulent.
Involucres

3.5–4.5 mm.

4–6 mm.
Corollas

pinkish white to pink, glabrous.

white to slightly pinkish, glabrous.
Phyllaries

apices acute, abaxial faces puberulent.

apices acute, abaxial faces glabrous or nearly so.
Heads

clustered.

clustered.
Cypselae

sparsely hispidulous.

hispid.
2n

= 34.

Ageratina wrightii

Ageratina havanensis
Phenology Flowering (Jul–)Aug–Oct(–Nov). Flowering mainly (Sep–)Oct–Nov(–Dec), also Apr–Jul.
Habitat Limestone slopes, ledges, alluvium, in brushy vegetation Bluffs, limestone outcrops and slopes, ledges along streams, often in oak-juniper woodlands
Elevation 1300–2200 m (4300–7200 ft) 100–900 m (300–3000 ft)
Distribution
from FNA
AZ; NM; TX; Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
TX; Mexico; West Indies (Cuba)
[WildflowerSearch map]
[BONAP county map]
Discussion

Ageratina havanensis apparently is the only species of the genus in the flora area with evergreen-persistent leaves.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 552. 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. rothrockii, A. shastensis, A. thyrsiflora
A. adenophora, A. altissima, A. aromatica, A. herbacea, A. jucunda, A. lemmonii, A. luciae-brauniae, A. occidentalis, A. paupercula, A. rothrockii, A. shastensis, A. thyrsiflora, A. wrightii
Synonyms Eupatorium wrightii Eupatorium havanense
Name authority (A. Gray) R. M. King & H. Robinson: Phytologia 19: 228. (1970) (Kunth) 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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