Emergence of the crabapple leaves

It was so exciting when I saw the first trace of leaves of the season  -- the little folded up green on the crabapple trees.  On April 9, I saw no sign of leaves on the crabapple trees.  On April 10, I was home sick and did not see the trees.  When I returned to the office on April 11, there they were! I was jubilant!  Ever since then, I've been watching their progression.

April 12:

April 15:

April 16:

April 17:

April 18:

April 23:

April 25:

Magnolia blossoms

The magnolia tree by the Greene Building is starting to blossom.

Is this a red maple?

This tree seems somewhat like a red maple, based on the color of the spring buds and the autumn leaves.  But the leaves are smaller than what I see on other red maples.  Is it something else? An amur maple? A hybrid?

April 9:

April 18:

Red maples flowering in April

April 4:

April 12:

April 17:

Redbud

This is what redbud looks like before the leaves and flowers emerge.

Magnolia buds crack open

The buds on the magnolia tree by the Science Center swell, crack open, and reveal pink within.

April 9:

April 12:

Shrub with yellow flowers

There is a shrub with yellow flowers that has been catching my attention because it is flowering earlier than many other things.  There are shrubs like this at various places around RPI, including near the dumpsters that are near the library, and near the hawthorns that are near the Greene Building.

April 4:

April 9:

April 12: