Medicago radiata is a common annual, found in the arid Middle East, but not penetrating the extreme desert. In Israel, it is frequent in hte Negev Desert Highlands. Here u can see a flower and a fruit. This fruit has only 1 (unfinished) coil, unlike many other medicks. The tiny flower is usually self-pollinated.
Medicago rotata is a common Mediterranean annual. It is hard to photograph it with the green beackground of other plants, so I shifted the stem on a neighbouring rock to solve this.