Utricularia macrorhiza

U. macrorhiza is a floating plant with six to twenty large, bilaterally symmetrical, yellow flowers that appear in June, July, and August, and are held on an erect stem.[3] U. macrorhiza is distinguished from other similar species by its flowers, which are larger than those found on any other bladderwort.[3]

The bladders which give common bladderwort its name are used to trap and consume prey.[3] Small organisms trigger the hairs on the pores of the bladder as they brush against it, causing the pore to open inward, allowing a rush of water into the bladder which pulls the prey in as well.[3] The pore immediately closes behind the prey, which is then digested by enzymes within the bladder.[3] The process of trapping the prey from opening to closing the pore takes place in 0.002 seconds.[3] If large prey becomes stuck in the pore, the prey is digested by the enzymes bit by bit until the pore closes again.[3]

In North America, U. macrorhiza is found throughout the United States and Canada.[1][3] In this range, it is found mostly in ponds and lakes, but also in slow-moving streams and rivers.[3] It shares the northern half of its range with a similar, related species, U. minor, lesser bladderwort.[1]

• List of Utricularia species

• USDA plant profile