Linked from
The 14 pages that link to Leaf vegetable, each with the reason it gives.
KaleNarrower topic: Kale is grown chiefly for its edible leaves.
CeleryNarrower topic: Celery leaves are edible, though its stalks are more commonly eaten.
Bok choyNarrower topic: Bok choy is valued both as a leafy green and for its substantial stalks.
RapiniNarrower topic: Rapini is valued chiefly for its leaves and tender stems as well as its buds.
Choy sumNarrower topic: Its leaves are one of the principal edible parts of choy sum.
Collard greensNarrower topic: The edible leaves, rather than a root or flower, are the crop.
EndiveNarrower topic: Endive is grown and eaten chiefly as a leafy vegetable.
Eruca sativaNarrower topic: The leaves, rather than the seeds or roots, are the usual food harvest.
Ipomoea aquaticaNarrower topic: Water spinach is harvested mainly for its tender leaves and shoots.