PIne trees are evergreen and do not have flowers or blossoms, just pine cones.
The photo in the arborday link is the honey locust and that from Wikipedia is the Horse Chestnut. The photo you like from wiki is that of the Horse Chestnut after it has bloomed.
Pictures can be deceptive due the the photographer’s choice of distance, lighting, focus, angle and personal vision.
The flowers on trees are complicated and varied.
I have been using the pocket-sized “The Audobon Society Field Guide to North American Trees” to Id and study trees for decades. It is much easier than going online. Just roam around your neighborhood over the next few weeks and see what is blooming.
Check out also the Linden tree.