Splitting seed pod of Willow Herb
Willow herb (Epilobium ciliatum) has loculicidal fruit. The fruit is a long, slender pod that contains the seeds. Loculicidal means that the pod splits longitudinally (lengthwise), sort of like peeling a banana (according to Michelle).
["Locule" means "little place" in Latin. In plants, it's a small compartment (a chamber within the ovary) that contains the seeds.]
Here are a few more views of this graceful arching seed pod and its symmetrical arrangement of seeds.
Note that each seed has a white hair-tuft to aid in dispersal by wind.
Here's the flower itself. On Bodega Head it's found in freshwater marshes and wet roadside ditches.
P.S. Happy Solstice!