There are many provisions in ICBN to conserve names which may actually be wrong. Article 14.2.of ICBN says, "Conservation aims at retention of those names which best serve stability of nomenclature". Stability like, the name of family Orchidaceae Juss., Gen. Pl.: 64. 4 Aug 1789. is conserved against Orchidaceae Adanson, Fam. des plantes 2: 68 1763.
Just based on the popularity of usage, Xanthium indicum may be considered conserved, but it is not yet conserved, as atleast the plant list or GRIN doesnt consider them as same. For this particular case, it is yet to be resolved according to The Plant List and both are till now considered distinct species with Xanthium indicum Roxb. is an unresolved name but synonymous with Xanthium inaequilaterum DC.. WHEREAS Xanthium strumarium L. Sp. Pl. 987 1753 is an unresolved name. Regards Pankaj On Oct 20, 2:25 am, Satish Phadke <[email protected]> wrote: > Agreed it has to be vice versa. Thanks for pointing out that. Even The plant > list has something else to say. I cant go more deeper in that context. > > On Wed, Oct 19, 2011 at 10:12 PM, Gurcharan Singh <[email protected]>wrote: > > > > > > > > > > > Satish ji > > Yes the identification is correct, but I fail to understand how Xanthium > > strumarium, a much earlier name be synonym and X. indicum, the accepted name > > > -- > > 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 Wed, Oct 19, 2011 at 9:40 PM, Satish Phadke <[email protected]>wrote: > > >> *Xanthium indicum* Syn *Xanthium strumarium* > >> Family : Asteraceae > >> Marathi : Shankeshwar शंकेश्वर A vweed common on roadside > >> Observed flowering in open areas around Pune city last few days > >> Large herb Annual about 1m in height. > >> Stem branches rough hairy. > >> Leaves serrate alternate 5-8 cm ovate acute triangular or lobed' appressed > >> hairy. > >> Flower heads 0.4-0.8mm across. Green when young in terminal and axillary > >> spikes.Barren heads crowded at apex. Fertile heads fewer. > >> Fruits 2cm long with 2 erect mucronate beaks covered with hooked prickles. > >> Achenes 1cm bye 0.4 cm oblong or ovoid. Compressed black. > > >> -- > >> Dr Satish Phadke > > -- > Dr Satish Phadke
