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Conservatory Virtual Tour-Carnivorous Plants
 
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Aquatic Plants
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Carnivorous Plants
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Cycads and Gymnosperms
Ferns and Fern Allies
Orchids and Bromeliads
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A  plant that is carnivorous attracts, kills, and digests animal life forms. Some plants may have some of these characteristics, but in order to be considered truly carnivorous, a plant must exhibit all of the above traits. Native to mineral-poor soils, these plants have developed modified leaves which have the ability to absorb nutrients from insects they digest. The modified leaves form traps to lure, capture and digest prey. There are four types of traps in seed-bearing carnivorous plants: the closing trap, the pitfall trap, the trapdoor, and the flypaper trap.

The Venus Fly Trap, photo upper left, is an example of the closing trap. The trap leaves consist of two halves resembling a clamshell. Each exhibit a bright reddish color which helps to lure in the prey. Nectar glands along the leaf margins also attract prey. Each inner half has three smaller, finer trigger hairs in a triangular pattern which, when properly stimulated by an exploring insect, initiate trap closure. Once the insect has been captured, the digestive glands secrete juices and absorb nutrients over a span of 3 to 5 days. The trap will reopen after digestion is complete.

Pitfalls, as displayed by Pitcher Plants, are a second type of trapping mechanism found in carnivorous plants. The modified leaves of these plants are tubular, and when the prey is lured to the opening, it enters or falls in and is unable to escape. The inside of the pitcher has a slick, waxy lining and there are numerous hairs pointing downward to prevent escape of the prey. The digestive glands are located at the bottom portion of the pitcher.

Sundews and Butterworts have the flypaper, or adhesive trap, with numerous sticky glands covering the upper portion of the leaf. Small insects become intangled in the sticky "dew" and the leaf then curls up to trap and digest the prey.

 

Sarracenia purpurea
Sarracenia purpurea- Pitcher Plant


Nepenthes - Tropical Pitcher Plant
Nepenthes - Tropical Pitcher Plant
Photos by: Andrew G. Seymour

U. Longifolia
Utricularia longifolia - Bladderwort Flowers
Photo by: Andrew G. Seymour    

The trapdoor is an aquatic trap that has a flaplike door over a small entrance at one end. Bladderworts are an example of carnivorous plants that utilize these types of traps. The traps, or bladders as they are called, are bulb shaped with the opening surrounded by numerous hairs. Prey brushing by the sensitive hairs will send a signal for the bladder to expand, sucking in the prey and for the trapdoor to close.

Flowers of most carnivorous plants take second place in attention to the trap leaves. However, in case of the bladderworts, the flowers may be the most noticable part of the plant, and the part most easily used for identification. The leaves of bladderworts are minute and branching, with the majority of the plant below soil.

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