Ron,
Most of the Gauras that I am familiar with are wildflowers.
Those Gauras are perennials.
Try www.calflora.org go to the letter g in the scientific
names list, click Gauras.
This is a real interesting site, especially for Californians.
I got this from a link on the Plants Data Base:
http://plants.usda.gov./
Allen
Bastrop Co., SE Central Tx.
Zone 8