Ground Cherry

Looks a bit like Pysalis arenicola (cypresshead ground cherry) but again another photo would definitely help.

Wow! Nice shot! I've given you my best guess for a species. It's likely in family Solanaceae (home of tomatoes and nightshades) judging by the flower. It looks a lot like ground cherry, but hard to tell which type from the photo. If you have any photos of the leaves and an overall "body shot" of the plant that'd be even more helpful!