laevipes (Mountain laurel, native to Eastern US) This one from Judi?
Kalmia latifolia 'Keepsake'
Kalmia latifolia (Mountain laurel) | NPIN
“Dispensing pollen via catapult: Explosive pollen release in mountain laurel (Kalmia latifolia)”. Through careful tracking of pollen movement, this study documents one of the fastest plants ever described – mountain laurel flowers accelerate pollen at over 400 g, and the pollen reaches a top speed of around 3.5 m/s (about 8 mph).