The vegetable that is not a leafy vegetable is "lycopersicon esculentum".
Lycopersicon esculentum, commonly known as tomato, is not a leafy vegetable. It is actually a fruit that is used as a vegetable in cooking.
On the other hand, amaranthus spp, celsosia spp, corchorus spp, and telfaria occidentalis are all examples of leafy vegetables. Leafy vegetables are edible plants that are primarily valued for their leaves, which are consumed as a vegetable. They are a good source of nutrients such as vitamins, minerals, and dietary fiber, and are important components of a healthy diet.
Therefore, lycopersicon esculentum, also known as tomato, is the vegetable that is not a leafy vegetable.