Opposite budding winter twigs

In addition to the silver maples I saw at Peebles Island yesterday, I saw two trees with opposite buds.

There is a guide to winter twigs at http://www.ccfpd.org/NaturalResources/WinterTreeIDpocketguide.pdf which says that opposite buds can be found on the following types of trees:

Maple
Ash
Dogwood
Horsechestnut
Buckeye

Based on that web site, as well as The Sibley Guide to Trees, I think the first tree that I saw (at the top of the hill, between picnic area and shore) is probably a boxelder, because that seemed to be the only kind mentioned with white buds.  The Sibley Guide to Trees says that boxelder twigs are green, bluish, or purplish.  To me, these twigs are more of a red-brown.

The other thing I noticed was that over alongside the road, there was a stump with a lot of suckers growing out of it.

The stump seemed to have the diamond bark pattern seen in Norway maple, boxelder, and ash.  The twigs and buds resembled Norway maple, and did not resemble boxelder and ash, so I'm thinking this was a Norway maple.