Flora of North America species comparison

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Ageratina havanensis

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

erect (brittle), puberulent to glabrous.
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.
Peduncles

2–14 mm, minutely puberulent.
Involucres

4–6 mm.
Corollas

white to slightly pinkish, glabrous.
Phyllaries

apices acute, abaxial faces glabrous or nearly so.
Heads

clustered.
Cypselae

hispid.
2n

= 34.

Ageratina havanensis
Phenology Flowering mainly (Sep–)Oct–Nov(–Dec), also Apr–Jul.
Habitat Bluffs, limestone outcrops and slopes, ledges along streams, often in oak-juniper woodlands
Elevation 100–900 m (300–3000 ft)
Distribution
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.
Parent taxa 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
Synonyms Eupatorium havanense
Name authority (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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