Cultivated Buckwheat - from the Commodity Image Gallery

Buckwheat seed is used as a source of food and feed. It is not a true cereal and is one of the very few plants, other than those of the Gramineae family, used for their starchy seed, which is processed as a meal or flour.

USDA - GIPSA Education & Outreach
http://archive.gipsa.usda.gov/tech-servsup/visualref/grain_gallery/HTML%20Pages/buckwheat.html