Definition of "dielytra"

In spring, what a place it was for wild flowers!―as Lucy Raymond and her brothers well knew, having often brought home thence great bunches of dielytras and convallarias and orchises; and at any time some bright blossoms were generally to be found gleaming through the shade.

1871, Agnes Maule Machar, Lucy Raymond Or, The Children's Watchword, page 25