I planted this shrub 3 years ago. It came with the tag "Myrtleleaf Holly (Ilex myrtifolia). After researching on the internet, this plant doesn't look like the examples of myrtleleaf holly I have found; the leaves are serrated, not smooth. What is this plant?
It looks right to me. We had one... looked just like yours. Ilex aquifolium Myrtifolia. http://www.bluebellnursery.com/catalogue/trees/Ilex/I/1634106 http://www.havlis.cz/karta_en.php?kytkaid=314 http://www.gardenbestbuys.com/ilex/ilex_aquifolium_myrtifolia_shrub__2l/25061_p.html
'Angustifolia', 'Myrtifolia' and 'Serratifolia' are all similar, differing from one another in specific details. There are others of the same general character as well.