Hierarchal vs Non-Hierarchal Interfaces to Biological Taxonomy

In recent thread titled "Generalised Approach to Storing Address Details" in cdt, the following argument was make against hierarchal interfaces (not hierarchal data model):

"It has been proven in numerous research studies that menu's use is deletrious if nesting goes above two levels ... Very little in the world is hierarchical. Even the oft cited hierarchy of biological taxonomy, breaks down at several points."

Does anyone have a link to web pages that shows the overall biological taxonomy in a manner where it would be relatively easy to enter into a database. I am searching but haven't found an appropriate one yet. I would like to enter some portion of the biological taxonomy in a db with a hierarchal interface. If someone would be willing to enter similar information in a relational db like MS Access, we can compare hierarchal vs non-hierarchal interfaces in above case. Received on Thu Dec 14 2006 - 13:56:16 CST