How might an introduced plant species kill native plant species?

Help with plant species?

In science right now we are doing biology. We went to a forest and we had to take pictures of various plants and identify them. Unfortunately, i cant find these species, or, i don't know exactly how to find what they are called. Does somebody know the names of these plant species? http://img.photobucket.com/albums/v310/trin250/100_0803.jpg http://img.photobucket.com/albums/v310/trin250/100_0804.jpg http://img.photobucket.com/albums/v310/trin250/100_0811.jpg http://img.photobucket.com/albums/v310/trin250/n500842881_50197_7287.jpg http://img.photobucket.com/albums/v310/trin250/n500842881_50152_6967.jpg http://img.photobucket.com/albums/v310/trin250/100_0806.jpg Thanks!
Answer:

I know only that the last one is an Equisetum (horse-tail) hope it helps.

Sonya Scott at Yahoo! Answers Visit the source

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Other answers

The fourth pic is a terrillium it comes in red and yellow they grow in pennsylvania where I live .You can tell by the three petals on the flower. fairly rare.

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The first one is a may apple, Podophyllum peltatum.

supastremph

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