The fruit of the Aesculus or Horse Chestnut tree
These seeds are enclosed a protective outer covering called the seed coat, usually with some stored food. After fertilization and some growth in the angiosperm, the ripened ovule is produced. The formation of the seed completes the process of reproduction in seed plants (started with the development of flowers and pollination), with the embryo developed from the zygote and the seed coat from the integuments of the ovule.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Aesculus hippocastanum fruit."
http://en.wikipedia.org/wiki/File:Aesculus_hippocastanum_fruit.jpg
Wikimedia commons
CC BY-SA 2.0.
