Flora of North America species comparison

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Ageratina havanensis

Ageratina rothrockii

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

Rothrock's snakeroot
Habit Shrubs [trees], (30–)69–150(–200) cm. Perennials, (20–)40–70(–150) cm (slender, fibrous-rooted crowns, with slender rhizomes).
Stems

erect (brittle), puberulent to glabrous.

ascending to erect, puberulent to glabrate.
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;

petioles 2–20 mm;

blades (3–5-nerved) lanceolate to lanceolate-ovate, mostly 3–6 × (1.5–)2–3 cm, bases obtuse to truncate, margins serrate to crenate, apices acute to acuminate, sparsely puberulent abaxially, mostly along nerves.
Peduncles

2–14 mm, minutely puberulent.

5–12(–20) mm, puberulent.
Involucres

4–6 mm.

5–7 mm.
Corollas

white to slightly pinkish, glabrous.

white, lobes short-villous.
Phyllaries

apices acute, abaxial faces glabrous or nearly so.

apices acute, abaxial faces glabrous or glabrescent, eglandular.
Heads

clustered.

clustered.
Cypselae

hispid.

sparsely and finely strigose-hirsute.
Powell

on label].
2n

= 34.

= 85 [ca. 100, fide A. M.

Ageratina havanensis

Ageratina rothrockii
Phenology Flowering mainly (Sep–)Oct–Nov(–Dec), also Apr–Jul. Flowering (Jul–)Aug–Oct.
Habitat Bluffs, limestone outcrops and slopes, ledges along streams, often in oak-juniper woodlands Rocky slopes and ledges, in oak-juniper, pine-oak, pine, aspen, and spruce-fir woodland
Elevation 100–900 m (300–3000 ft) 1700–2400 m (5600–7900 ft)
Distribution
from FNA
TX; Mexico; West Indies (Cuba)
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; NM; TX; Mexico (Chihuahua, Coahuila, Durango, Sonora)
[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.)

Ageratina rothrockii is similar to A. altissima, probably its western vicariant, and the two perhaps would be justifiably treated as conspecific.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 21, p. 552. FNA vol. 21, p. 550.
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. shastensis, A. thyrsiflora, A. wrightii
Synonyms Eupatorium havanense Eupatorium rothrockii
Name authority (Kunth) R. M. King & H. Robinson: Phytologia 19: 222. (1970) (A. Gray) R. M. King & H. Robinson: Phytologia 19: 216. (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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