Gurcharan Singh
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to Nidhan Singh, prasad dash, Rakesh, Indiantreepix
Yes Nidhan ji, you may be right. White flowered forms have been reported in this species according to the eFlora of Pakistan. Bright colour of leaves and long yellow prickles are characteristic for this species. By the way both S. xanthocarpum Schrad. and S. surattense Burm.f. are now treated as synonyms of S. virginianum L., considered as correct name for the species.
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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/