Medicago lupulina Balkar ji. Trifolium would have palmate compound leaves, all three leaflets of same stalk length. Here middle has much longer stalk, hence pinnate trifoliate.
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: 9810359089http://people.du.ac.in/~singhg45/