Dr. Art Gibson, a retired professor from UCLA now living in Georgetown, has an ongoing project aimed at providing field-based descriptions of the native and naturalized plant species of Williamson County. The descriptions are being posted here in their original (pdf) format at the Plant Resources Center Williamson County website as they are finished:
To see the available pdf descriptions (more added every month or two):
To see Dr. Gibson’s glossary of terms used in his descriptions [pdf]; [web page]
A web-friendly version of Dr. Gibson’s descriptions is also available from the following links.