Here is the dropdown displayed using the Shortcodes UI plugin, and it works great!:

Here is the expand code placed directly in the html:

Dropdown Test

This wonderful drop down is produced using the Collapse-Pro-Matic plugin, with a little inline styling applies. It should work fine for long species lists with species grouped in families and genera. The mock sidebar is produced using Catalyst’s EZ Columns. It is probable that we’ll have to tweak the column widths and replace the background with a jpeg that has a wider left purple area.

And here is a second paragraph, just to see how it will look and what the spacing between paragraphs look like. To simplify things, we might enclose this section within a div.