While open flowers are more conclusive for plant ID, this appears to be a young Japanese Holly (Ilex crenata). Some organizations consider the species to be invasive in Maryland (and it has appeared in a handful of counties), though fortunately relatively few have seeded into natural areas thus far. Japanese Holly can be very boxwood-like in overall appearance and, being evergreen and easy to trim, are often grown in home gardens as hedges and foundation plants. Not all varieties can produce seed (male cultivars don't fruit, and female cultivars can't fruit if they aren't pollinated by a male Japanese Holly), but when they do, the berries aren't the typical red color of most hollies, but inky-black and not always obvious, though birds or other wildlife must be finding and eating some of them for volunteers to appear in natural areas.

Miri