Leaves' main veins

Usage examples of midribs.

A pinna was cemented with shellac on the summit of a little stick driven firmly into the ground, immediately beneath a pair of leaflets, to the midribs of both of which excessively fine glass filaments were attached.

The leaflets, however, sometimes bend so much back that their midribs become parallel to and lie on the petiole.

They thus become imbricated with their midribs parallel to the petiole.

A young cotyledon or leaf after bursting free is brought down into its proper position, as already remarked, by epinasty, which, according to De Vries, long continues to act on the midribs and petioles.

At the edge of the channel were masses of strange plants with varicolored red-and-green leaves the size of doors, their midribs and veins all studded with golden spines.