Plants, botany and the illegality of the pursuit of happiness

Certain forms of botany and taxonomy are illegal. If a plant collector chooses a genus of plant which happens to have plants in it that have been scheduled their collection will never be complete. If they wish to have a complete collection they are labeled a criminal by the united states government. Do you have a right to the pursuit of happiness in this nation?
We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness. That to secure these rights, Governments are instituted among Men, deriving their just Powers from the consent of the governed, — That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government, laying its foundation on such principles and organizing its powers in such form, as to them shall seem most likely to effect their Safety and Happiness.