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Buckwheat (Fagopyrum esculentum, Moench). Polygonàccse. A tender annual grain plant, flour being made of the large 3-cornered fr. It is much grown in the N. U. S., usually being sown about the first of July. It is also a favorite for bee forage. Buckwheat is native to Cent. Siberia and Manchuria, and is now widely cult., although it is a grain of secondary importance. The Tartarian buckwheat (F. tatáricum, Gaertn.) is occasionally seen. It has smaller and yellowish fls., and a smaller roughish, wavy- angled fr. This species is often confounded with forms of F. esculentum, from which it is really easily distinguished. Buckwheat is a good cleaning crop for weedy and hard lands. For general discussion of buckwheat, consult Cyclo. Amer. Agrie., Vol. II. See Fagopyrum.