There is a large population of Medicago at Ramla Hamra (behind Tamarix africana wall) with a prostrate habit and legumes which look as those of M. polymorpha at first glance, but on closer look I dont think so. I got an idea from Weber's book that it is M. littoralis though the photo do not show (well) any legume.
Below are the photos of the plant and legume of the species I am talking about.
Asking maybe you have already identified it in the past.
Medicago
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Medicago
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TNX