Web Surf and then Visit Great Hills Park

Great Hills Park is one of NW Austin's best neighborhood parks
http://www.greathillspark.org
Created by the idea and hard work of Marie Laing, who also help co-author the City's Adopt A Park Program and a cadre of committed stakeholders, this is a magnificent park.
It has native landscaping, a trail, play scape, pavilion, picnic tables and two chimney swift towers.
There is a wonderful picture page "plants of Great Hills Park" page at
http://www.greathillspark.org/plantphotos/
Check it out!

Check Out EcoTexas

Take a look at http://www.ecotx.org
Lots of good information there on native plants and invasive species.