Lupinus havardii
 Lupinus havardii is a species of lupine known by the common names Big Bend bluebonnet and Chisos bluebonnet. It is native to Texas and Chihuahua where it blooms between January and June. Its habitat includes gravelly fine talus and the alluvial soils in the desert valleys hills and mountain slopes.It is an erect annual herb with a slender branching stem which can reach four feet in height. The flower is about half an inch long and purple to blue in color.