Each paper should have the following main headings with each linking to a page:

1.  Taxonomy:  Discussion of systematic 'context' of the species to include the higher ranks (class, subclass, order, etc. and the lowest (Genus, related species for infraspecific types, close relatives listed for other States, etc.), any differences of taxonomic opinion that you might dig up.

2.  Ecology/Distribution:  As much info that you can glean from public sources about the range of distribution, ecological amplitude, and maybe ecological 'connections' (other creatures dependent or associated with the species).  Resolution or detail for distributions should not extend beyond the county level.

3.  History:  Include here both past (when listed and why) and future (increasing, decreasing, going extinct, etc.)

4.  References:  page for listing of either hardcopy or web based sources that can be accessed from the other pages via internal links with each ref cited
 
This represents a 'base' structure that can be expanded with other headings if you come across information that does not 'fit' under the three 'content' items listed above.
 

 Possible Resources:

U.S. Fish and Wildlife Service - Full listing
Texas Parks and Wildlife page
Texas Endemics from the Flora of Texas Consortium
National Biological Service (not sure if anything of use here - might have to dig)
The Nature Conservancy

Basic HTML - a bit more detail and special character codes and colors
Search: Alta Vista or Webcrawler or HotBot or Lycos or multiple engines
Browse:  Botanical links (see base of this page for more a more detailed botanical listing site)