Panikola or Duck lettuce, ottelia alismoides
Panikola or Duck lettuce (ottelia alismoides, family: hydrocharitaceae) is an annual submerged herb grows in the paddy fields and at the edge of water bodies. The short-stemmed aquatic plant prefers shallow water bodies and can survive in strong light. Its roots along with rhizome are ingrained in soil. It is found in the tropical and subtropical Asia, Africa and Australia.