Mystery Flowers 12 (Limerick) Poem by Kim Barney

My neighbor across the street has the same type of flowers, and hers have been in full bloom for more than two weeks, and mine are yet to bloom (and here it is the 14th of August) !
The difference is that hers are in full sun, and mine are on the shady side of the house. Mine will keep blooming for weeks after hers are gone. That's the upside.

This is not a contest. There is no prize for identifying these flowers, just the satisfaction of doing so.