The greenish puffleg (Haplophaedia aureliae) is a species of hummingbird in the "brilliants", tribe Heliantheini in subfamily Lesbiinae.

[7] Subspecies H. a. caucensis has grass green upperparts with a more intense coppery tinge on the head and rump than the nominate, and also a white patch on the belly.

Males of H. a. floccus are similar to caucensis but with paler green underparts and less of a coppery tinge on the upperparts, but in addition bright cinnamon uppertail coverts.

H. a. russata has a longer bill and brighter copper upperparts than the nominate and its underparts are scaled brown rather than grayish white.

[7] The greenish puffleg forages for nectar mostly in the lower levels of the forest but will go to the canopy to feed at flowering Inga trees.

[7] The greenish puffleg's breeding season appears to be from December to March but nesting activity has been recorded in other months as well.

The female builds a cup nest of moss and cobwebs lined with fine plant material and suspends it below a large leaf that provides protection from rain.