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"Ascidium of a Plant. Leaf of pitcher-plant (Nepenthes) with a winged petiole and terminating in an operculate pitcher."-Whitney, 1902

Ascidium

"Ascidium of a Plant. Leaf of pitcher-plant (Nepenthes) with a winged petiole and terminating in an…

Here is a leaf of the pitcher plant. You see that it has an opening at the upper end. It can hold considerable water.

Pitcher Plant Leaf

Here is a leaf of the pitcher plant. You see that it has an opening at the upper end. It can hold considerable…

Here is a leaf of the Venus's fly trap which is a spring trap for flies and other insects. Here you see the leaf as it is spread out, wide open.

Venus Fly Trap Leaf

Here is a leaf of the Venus's fly trap which is a spring trap for flies and other insects. Here you…

Here is a leaf of the Venus's fly trap which is a spring trap for flies and other insects. The two parts of the leaf close together and the points on the edges are locked together.

Venus Fly Trap Leaf

Here is a leaf of the Venus's fly trap which is a spring trap for flies and other insects. The two parts…

The pitcher plant is remarkable for having the end of its leaf turned up so as to form a complete pitcher, filled with water, and covered with a lid. This design helps it to trap unsuspecting insects that are then digested.

Pitcher Plant

The pitcher plant is remarkable for having the end of its leaf turned up so as to form a complete pitcher,…

Leaves of Pitcher-plant, one of them cut off, (Gray, 1858).

Pitcher-plant

Leaves of Pitcher-plant, one of them cut off, (Gray, 1858).

A rosette of leaves of Venus's flytrap seen from above.

Venus Flytrap

A rosette of leaves of Venus's flytrap seen from above.