Desmodium micropillum or undupiyaliya is a Night sleeping flowering plant that native  to Sri Lanka India and America. Naturally found on grass lands, border of water streams, paddy fields or anywhere with rich wet soil but not consider as a weed that best food for Rabbits. It is popular lands cape plant for gardens because of it's growing habitat that small vine scrambles along on the ground called "Ground cover". it is also used for Ayurveda remedies.
Desmodiums start sleep at the evening - The plant leaves fold upright at the night