It was a spoof on Robin Hood, and specifically lampooned a BBC version of the tale. John Cleese played Dennis Moore, a thief trying to redress social inequalities, but he wasn't quite up to the job. As part of the zaniness, he would steal lupines, and bring the flowers to the peasants he was trying to aid.
Or your lupine slinger could just be a fan of Monty Python's Flying Circus -- (if you've seen the show, you'll know why I used this song as a reference) -- "Dennis Moore, Dennis Moore, riding through the glen/ Dennis Moore, Denis Moore, has lots of friends/ Robs from the poor, gives to the rich/ the stupid bitch."
There are at least five varieties of Lupinus that grow in various parts of Texas, and they are all called Blue Bonnets...it's ( they're) the State Flower...one of the quickest ways to expose yourself as a yankee is to call 'em lupines....like callin' a cedar tree a juniper, or callin' a possum an o'possum...
