Who's got the button (bush)?

Photo by Ned Harris 11/14/2012

Yes, these are Button Bush (Cephalanthus occidentalis) fruits - some still developing. The 'button' is composed of dozens of individual flowers. Note the long, thin style [one of the female parts of the flower] sticking out of some of them. Each flower can grow a seed, provided the flower is pollinated [with pollen from the male parts]. The plant is a real magnet for insects when in bloom, so there's usually no problem getting the pollen where it needs to go!
Answer to yesterday's fruit question: Common Cocklebur (Xanthium strumarium).