Examples of species hybrids

Some plant hybrids include:

Leyland cypress, [x Cupressocyparis leylandii] hybrid between Monterey Cypress and Nootka Cypress.
Limequat, lime and kumquat hybrid.
Loganberry, a hybrid between raspberry and blackberry.
London plane, a hybrid between Plantanus orientalis Oriental plane and Plantanus occidentalis American plane (American sycamore). Thus forming [Plantanus x acerfolia]
Peppermint, a hybrid between spearmint and water mint.
Tangelo, a hybrid of a Mandarin orange and a pomelo which may have been developed in Asia about 3,500 years ago.
Triticale, a wheat–rye hybrid.
Wheat; most modern and ancient wheat breeds are themselves hybrids. Bread wheat is a hexaploid hybrid of three wild grasses; durum (pasta) wheat is a tetraploid hybrid of two wild grasses.
Triangle of U: cabbage, mustard etc.
Grapefruit, hybrid between a pomelo and the Jamaican sweet orange.
Some natural hybrids are:

White flag Iris, a sterile hybrid which spreads by rhizome division
Evening primrose, a flower which was the subject of famous experiments by Hugo de Vries on polyploidy and diploidy.
Some horticultural hybrids:

Dianthus x allwoodii, is a hybrid between Dianthus caryophyllus × Dianthus plumarius. This is an "interspecific hybrid" or hybrid between two species in the same genus.
x Heucherella tiarelloides, or Heuchera sanguinea × Tiarella cordifolia is an "intergeneric hybrid" a hybrid between two different genera.
Quercus x warei [Quercus robur x Quercus bicolor] Kindred Spirit Hybrid