This post showing comparative pictures of Chromolaena odorata
AND Ageratina adenophora
... hopefully will help to reduce any confusion between them.
Here are some excerpts from earlier post of Gurcharan ji [ https://groups.google.com/d/topic/indiantreepix/jRwrq_wfsFM/discussion
... it will further help in distinguishing them.
from Gurcharan ji:
.... leaves (of Ageratina)
much larger and broader than Chromolaena odorata
. The inflorescence is also much different, an erect spreading panicle in Ageratina
: Phyllaries persistent, 8–30 in 2(–3) series, 0- or 2-nerved, lanceolate to linear, ± equal (herbaceous). Florets 10–60; corollas white or lavender, throats obconic to campanulate (lengths 1.5–2 times diams.); styles: bases sometimes enlarged, glabrous, branches linear, seldom distally dilated.
: Phyllaries usually readily falling (at least in fruit), 18–65+ in 4–6+ series, 3–5-nerved, ovate to oblong or lanceolate, unequal (papery or herbaceous), outer shorter. Florets [6–]15–40[–75]; corollas white or purple to blue, lavender, or reddish, throats cylindric (lengths 3–4 times diams.); styles: bases not enlarged, glabrous, branches linear to linear-clavate.
from Vijayasankar ji:Ageratina adenophora
ALWAYS occurs in higher altitudes, whereas, Chromolaena odorata
is usually found in plains (may be with some exceptions).
has purplish stems and petioles, while C.o.
is generally green throughout.
can also be distinguished by its leaves which as
triangular (deltoid) in outline with a more or less truncate (straight)
base (except subcuneate at petiole).
Many thanks to Gurcharan ji and Vijayasankar ji for making it easy to sort these two species.