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.
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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/