I thought this was some sort of oak for awhile, until seeing it flower. There appears to be at least two of these that showed up in my yard not long ago, in an unkept area. I thought this was going to be an inkberry holly, but the leaves seem to be a bit too slender and pointy for that, comparing pictures between the two. The flowers all have four petals and are about 1/4". The clusters all come out at the same point in the stem. Location: acidic soil, low area, bordering on a swamp, North-Central Florida.