Plant expert Reply:

[sanrob]

Plant expert Reply: It is very difficult to tell American Hollies (Ilex opaca) from English Hollies (Ilex aquifolium). Every resource on hollies will tell you that English Hollies have glossier leaves. Well that is all well and good if you have them side by side, but glossy is a very subjective attribute. For example in the pictures above, I can’t really tell the difference in the glossiness of the leaves. According to the American Horticulture Society, their leaf description is very similar. English Holly leaf – Elliptic or ovate, glossy, dark green leaves with entire, wavy, spine-toothed, or spiney margins. American Holly leaf – oblong-elliptic, spine-toothed or entire, leathery matte, dark green leaves.

[sdxadmin · Accepted solution]

For me the best way to tell them apart is by the older leaves. The American holly leaves tend to have a dark appearance and a more matte finish. The new leaves will always have a glossy look similar to the English Hollies. I have to be honest, even with this little trick, I have missed the mark a few times.  The nice thing about these two types of hollies is that they can be used interchangeably.  So unless you are trying to match a replacement shrub you can use which ever one is available.