Inflorescences are borne singly emerging from the leaf axil. The inflorescence is an erect panicle arising from the leaf axil. They are borne in thick clusters on long branchlets or the leaf axil. There are three to several flowers in the axil of each floral leaf. The inflorescences have a simple structure with one per axil. Each flower grows from the axil of a leathery bract. Adjacent to the axil, sporangia are created from artificial cells. All specimens with red marking at axil, behind pectoral fin. The flower stem lies in the axil of the second true leaf. The flower stalk at the leaf axil is long, tilting at the single flower. The inflorescence is simple with mostly two flowers per axil, but sometimes distributed in racemes. Clusters of flowers grow in the plant axil and are white to blueish in color. They are usually solitary, but occasionally an axil will carry two flowers. Sporangia are borne in the axil or on the adaxial surface of the sporophyll. All "Potamogeton" have a delicate membranous sheathing scale, the stipule, at the leaf axil.