this one just happened by random mutation, and turned out to be popular
with insect pollinators.

Nah. It is probably one of those things God created on the first Sabbath when
He was supposed to be resting, along with Welwitschia, the duckbill platypus,
the Boojum tree, and Masdevallia caudivolvula.

Iris,
Central NY, Zone 5a, Sunset Zone 40
"The trouble with people is not that they don't know but that they know so much
that ain't so."
Josh Billings (Henry Wheeler Shaw), 1818-1885