caryopsis

Fruit oval, flat, with the outer face rather convex and the inner concave, sharp-margined, a caryopsis, i.e. the thin pericarp adherent to the vertical seed.

Such a fruit is termed a caryopsis or grain.

The caryopsis consists of an embryo on one side at the base and the endosperm occupies the remaining portion.

As an illustration of the caryopsis, the grain of Andropogon Sorghum may be studied.