Thanks for the story-so I was right about the labia connection! I'll have to find another video about the entrapment idea..

In reply to this comment by rembar:
Seph, it isn't quite so Freudian as all that, but still a rather interesting story. From Sarracenia.com:
"The true reason that Venus is part of this plant's name due to the dirty minds of the kooky naturalists and nuserymen (such as John & William Bartram, Peter Collinson, William Darlington, Arthur Dobbs, John Ellis, and Daniel Solander). When they looked at the plant, they saw in its amazing behavior and attractive form (two red, glistening lobes, surrounded by hairs, sensitive to the touch), something that reminded them of female genitalia of their own species. Indeed!

Amongst themselves, this cabal of learned perverts referred to the plant as a "tipitiwitchet" (or "Tippity Twitchet"). It was subsequently assumed by historians that this was a Native American term, but linguistic experts have eliminated that as a possibility.

Tipitiwitchet, it appears, was a naughty euphemism of their own devising. I like to imagine a few of them coining the term one night as they were slamming down beers in a pub or in a sumptuous study. I'm guessing that the originator of the term was probably John Bartram. For while you might expect a scientist to express wonder or astonishment upon seeing the plant, Bartram wrote to Collinson on 29 August 1762 that "my little tipitiwitchet sensitive stimulates laughter in all ye beholders"."

Woah. Those carnivorous plants are pretty hardcore.

Especially the one that ate the frog. Damn!

I love carnivorous plants. There was a long period of time where I wanted to be a plant geneticist largely because of them. Outstanding organisms.

A short read:
http://www.sciencedaily.com/releases/2005/01/050127233724.htm

I looked for the sited original article, but couldn't find it. Dah!

There's actually a few small intermediary steps, to my understanding, in Rychan's otherwise neat explanation:
- Plants with more color and/or small pockets of mass that will catch rain water and accumulate sugary liquid from the plants glands or pollent are selected because they attract more insects for pollination. (Significant because it describes the creation of what will become a trapping ground later.
- Plants are selected for larger and larger liquid-holding pockets, which eventually evolve into phytotelmata.
- Insects fall into the phytotelmata, and local bacteria and parasites digest the insects, leaving basic nutrients that the plant can then absorb. (This bridges the evolutionary gap of the plant evolving the ability to trap insects at the same time as evolving the ability to digest the insect, a la blind watchmaker.)
- The plant develops small mutations (downwards-growing hairs, slippery sides) that lead to insects becoming trapped at a greater percentage. Some pitcher plants' evolutionary journeys end here.
- The intercellular methods of absorption of the digested insect nutrients are developed and eventually the plant evolves the ability to break the dead insect down into its basic amino acids through the production of proteases and phosphotases. (I haven't come across one definite mechanism for the evolution of the ability to create these enzymes, although viral transduction/transmission seems to me to be a pretty good possibility.)
- The modern day pitcher plant is born.

Carnivorous plants are a fascinating topic of biomechanics and evolutionary mechanisms. Some neat papers and links to check out:
http://www.botany.org/Carnivorous_Plants/
http://www.skepticfiles.org/evolut/meatplnt.htm
http://www.botanical.com/botanical/mgmh/p/pitche42.html

Cameron, K.M., Wurdack, K.J., and Jobson, R.W. 2002. Molecular evidence for the common origin of snap-traps among carnivorous plants. American Journal of Botany 89:1503--1509.
Evolution of the Genetic Architecture Underlying Fitness in the Pitcher- Plant Mosquito, Wyeomyia smithii
Peter Armbruster, William E. Bradshaw, Christina M. Holzapfel
Evolution, Vol. 51, No. 2 (Apr., 1997), pp. 451-458
http://links.jstor.org/sici?sici=0014-3820(197506)29%3A2%3C296%3AEAEOTP%3E2.0.CO%3B2-9

Botany is certainly *science.

Some good info on carnivorous plants can be found here.
A very neat article on the biomechanics of the Venusfly trap's closing mechanism can be found here.