Celandine poppy

 Stylophorum diphyllum, Celandine poppy or wood poppy, is native to low elevation deciduous forests in the Eastern U.S.  But it's thrived in our Western North Carolina garden, spreading by seed.  It's a wonderfully long-flowering native wildflower, providing bright yellow flowers early in the season.

I took some plants to a plant swap this weekend and our host asked me how the fruits ripened (he had a plant, perhaps from me, in his garden already).  

I thought it must become dry and then pop open, but my gardening companion later that day discovered that the fruits popped open while green, and the seeds had elaisomes, so are ant-dispersed.  News to us, but so fun.  No wonder the seeds get around in our naturalistic garden!