Thanks Dinesh ji, great job done. I would also be uploading my photographs from Delhi of Chromolaena
-- Dr. Gurcharan Singh Retired Associate Professor SGTB Khalsa College, University of Delhi, Delhi-110007 Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018. Phone: 011-25518297 Mob: 9810359089 http://people.du.ac.in/~singhg45/ On Sat, Apr 16, 2011 at 11:13 AM, Dinesh Valke <dinesh.va...@gmail.com>wrote: > Dear friends, > > 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. > > > xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx > > 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*. > > *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. > > *Chromolaena*: 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. > > xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx > > from Vijayasankar ji: > > *Ageratina adenophora *ALWAYS occurs in higher altitudes, whereas, > *Chromolaena > odorata *is usually found in plains (may be with some exceptions). > *A.a. *has purplish stems and petioles, while *C.o.* is generally green > throughout. > *A. adenophora *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). > > xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx > > > Many thanks to Gurcharan ji and Vijayasankar ji for making it easy to sort > these two species. > > > Regards. > Dinesh > > > > >
