The common thistle, aka the Scottish thistle (the national flower of Scotland); I have some Scottish blood so I loved having this in my yard:
Bumblebee covered in pollen, it looks like it's been coated in powdered sugar
And then this GIANT bumblebee came by... here's a shot with a regular sized one to show the comparison. He's so furry. When he flew around me taking pictures, I called him a "helicopter", lol. I learned that in South America they have bumblebees the size of mice?!
"Nom, nom, nom!"