Weirvines (fluitdolusaceae) are family of pitcher plant descended from dump vines. They can be found in the rivers and saltree forests of the east coast of north america. They usually grow to about 10-15 feet long and come in a variety of colors. They are an extremely diverse family and most genera and species are extremely limited in range.
Their name comes from the fishing weir, a trap set up along rivers to catch fish swimming downstream. Just like the weir, weirvines catch their prey with the river's flow. The traps all grow at the end of the vine and are situated towards the current. The ends of the vine are tougher than the rest of the plant and are coated with a hydrophobic wax so that it isnt carried off.
The main vine is covered with heart shaped leaves that lead all the way up to the flowers. The flowers only bloom once a year and come in several colors. They are pollinated by insects and produce a small seed that is dispersed by small birds. The seed grows from bird nests and the sprout wraps itself around a branch and grows downwards. They also reproduce via rhizome like their ancestors.
The traps can grow up to the size of a coke can. The main prey of the weirvines consist of fish larvae, insect larvae, small crustaceans, and sometimes small fish.
Target: the underside of the operculum is brightly colored to draw the attention of aquatic organisms.
Trigger hairs: The inside of the trap has a ring of trigger hairs that are coated with a thick layer of hydrophobic mucilage that draws in prey. Once the hairs are touched, the trap is triggered. The glands around the hairs produce strong acid once the trap closes that mix with the water inside.
Peristome: the peristome produces nectar that mimics pheromones to attract prey.
Operculum: The operculum is linked to the trigger hairs. The cells in the operculum contract and rapidly shut on both sides, trapping the prey inside.
Stem: the stem is almost woody and is connected to the bottom of the trap. It has hydrophobic wax, which makes it a favorite preening tool for local birds.