"Bluebonnets are a form of the lupine flower coming from the Latin word lupus, meaning wolf. They are called "wolf flower" because it was once believed they "devoured" the soil of nutrients, because they are found growing where nothing else can grow. It is now known otherwise that bluebonnets in fact add to the nutrients of the soil."

http://www.dialuptexas.net/texas_state_flower.htm

A little googling, wwh, and Viola's your aunt!