Ageratina havanensis
Ageratina altissima
Havana snakeroot, shrubby boneset, white mistflower, white shrub mistflower
white snakeroot
erect (brittle), puberulent to glabrous.
ascending to erect, sometimes semiscandent, puberulent (hairs minute, crisped).
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 (5–)10–30(–50) mm;
blades usually deltate-ovate to ovate or broadly lanceolate, sometimes ovate-lanceolate, 4–11(–13) × 2.5–8(–9) cm, bases usually rounded to truncate or obtuse, sometimes cordate, margins coarsely and doubly incised-serrate, apices usually acuminate.
2–14 mm, minutely puberulent.
1–5 mm, puberulent.
4–6 mm.
4–5 mm.
white to slightly pinkish, glabrous.
white, lobes sparsely short-villous.
apices acute, abaxial faces glabrous or nearly so.
apices acute, abaxial faces glabrous or sparsely and finely villous.
clustered.
clustered.
hispid.
glabrous.
= 34.
Ageratina havanensis
Ageratina altissima
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.)
Varieties 2 (2 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Phyllaries 3–5 mm, apices not cuspidate | var. altissima |
1. Phyllaries 4–7 mm, apices cuspidate to acuminate | var. roanensis |
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