dimidiately

The _first glume_ is concave, pale yellow, shining and cartilaginous to about 2/3 its length from the base, and the upper third is membranous, dimidiately ovate; at the back in the cartilaginous portion, there are three to six deep convex smooth ridges running across the glume; the membranous tip is thin and with anastomosing green veins; the margins of this glume are thick, narrowly incurved, ciliolate, and with a narrow wing on the outer margin.

A Handbook of Some South Indian Grasses K. Rangachari