The Hoary Puffleg is a hummingbird of humid forests on the eastern Andes. It seeks nectar in the lower forest and along its edges.
The genus has generally dull green plumage and a dark green to bluish-black tail. Males have white and cinnamon-colored thigh tufts.
It forages in the understory and edges of dense forest, taking nectar. The study describes the genus as relatively territorial; the species account lists it as resident.
An extinction-risk assessment has not been added yet.