Flora of North America species comparison

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Ageratina havanensis

Ageratina wrightii

Havana snakeroot, shrubby boneset, white mistflower, white shrub mistflower

Wright's snakeroot
Habit Shrubs [trees], (30–)69–150(–200) cm. Shrubs, 50–150 cm.
Stems

erect (brittle), puberulent to glabrous.

erect, puberulous.
Leaves

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.

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

2–14 mm, minutely puberulent.

1–3 mm, puberulent.
Involucres

4–6 mm.

3.5–4.5 mm.
Corollas

white to slightly pinkish, glabrous.

pinkish white to pink, glabrous.
Phyllaries

apices acute, abaxial faces glabrous or nearly so.

apices acute, abaxial faces puberulent.
Heads

clustered.

clustered.
Cypselae

hispid.

sparsely hispidulous.
2n

= 34.

Ageratina havanensis

Ageratina wrightii
Phenology Flowering mainly (Sep–)Oct–Nov(–Dec), also Apr–Jul. Flowering (Jul–)Aug–Oct(–Nov).
Habitat Bluffs, limestone outcrops and slopes, ledges along streams, often in oak-juniper woodlands Limestone slopes, ledges, alluvium, in brushy vegetation
Elevation 100–900 m (300–3000 ft) 1300–2200 m (4300–7200 ft)
Distribution
from FNA
TX; Mexico; West Indies (Cuba)
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; NM; TX; Mexico
[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. herbacea, A. jucunda, 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. herbacea, A. jucunda, A. lemmonii, A. luciae-brauniae, A. occidentalis, A. paupercula, A. rothrockii, A. shastensis, A. thyrsiflora
Synonyms Eupatorium havanense Eupatorium wrightii
Name authority (Kunth) R. M. King & H. Robinson: Phytologia 19: 222. (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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