title: Bluebonnet (plant)
context: On March 7, 1901, Lupinus subcarnosus became the only species of bluebonnet recognized as the state flower of Texas;[2] however, Lupinus texensis emerged as the favorite of most Texans. So, in 1971, the Texas Legislature made any similar species of Lupinus that could be found in Texas the state flower.[3][4]
question: When were bluebonnets named the state flower of Texas?
answers: March 7, 1901