MacArthur and Chain Bridge. Go to Discovery School House on MacArthur Blvd. Across from that is the trail; take it into the woods 25 m to plot on right(very large Beech).
Very close to a small creek. Rocky upland; not on lower slope until underneath 10 cm of soil. -- Very large Quercus alba(93) and Liriodendron tulipifera just outside of plot.