Dear Mr. Surajit I was reading some of your mails above. Indeed you jumped deep into it and this is really nice of you to have so much of patience. There is one issue here I think Many of the characters you are talking about are so variable that they cant be trusted to define a species based on morphology. According to the protologue if you can see, both species are written as PERENNIAL. Leaves in both are heteromorphic and hence there is no distinct shape and size, unless and untill one it toooooo long or tooooo short. Even the margin shape is not consistent. The prominence of ribs of achenes also depends on how dry the seeds are. Pappus is 6-9mm in one and 8-14mm in another, so this is slightly overlapping too. I am forwarding this to Gunjan Sud also. May be she can dig something out of it. Best of luck. Pankaj
On Wednesday, 5 December 2012 00:11:47 UTC+8, surajitkoley wrote: > > Sir, > > I hope this is *Sonchus arvensis* Linnaeus (বন-পালং), as in my earlier > post at - > https://groups.google.com/d/topic/indiantreepix/ZlmjKtsjUr4/discussion. > > It's an experience to look back into history :- > > 1. > > http://ia700605.us.archive.org/BookReader/BookReaderImages.php?id=mobot31753000237401&itemPath=%2F1%2Fitems%2Fmobot31753000237401&server=ia700605.us.archive.org&page=n635_w1150.jpg > 2. > > http://ia600609.us.archive.org/BookReader/BookReaderImages.php?id=mobot21753000004407&itemPath=%2F0%2Fitems%2Fmobot21753000004407&server=ia600609.us.archive.org&page=n417_w1150.jpg > > ID Help :- > > 1. http://www.mpbd.info/plants/sonchus-wightianus.php > 2. > > http://plantillustrations.org/taxa.php?id_taxon=2478&lay_out=2&photo=0&volume_entire_work=&series=&volume_series=&all=&full_size=&illustration=&language=153 > > Some confusion :- > > 1. http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=242349619 > 2. http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=242349589 > 3. http://www.theplantlist.org/tpl/record/gcc-77555 > 4. http://www.theplantlist.org/tpl/record/gcc-97065 > 5. http://www.theplantlist.org/tpl/record/gcc-48853 > 6. http://www.ars-grin.gov/cgi-bin/npgs/html/taxon.pl?34932 > > Thank you & Regards, > > surajit > --
