orthotropous

Growing straight, so that the micropyle is at the end opposite the stalk. Used of an ovule.

In botany, growing vertically or straight: applied specifically to an ovule in which the chalaza is at the evident base, and the orifice at the opposite extremity, the whole ovule being straight and symmetrical.

Growing straight and having the micropyle at the apex

(of a plant ovule) completely straight with the micropyle at the apex