Feather cactus Mammillaria plumosa, blooming under rain, in late fall, almost winter!
Scientific classification
Kingdom:Plantae
(unranked):Angiosperms
(unranked):Eudicots
(unranked):Core eudicots
Order:Caryophyllales
Family:Cactaceae
Subfamily:Cactoideae
Tribe:Cacteae
Genus:Mammillaria
Species:M. plumosa
From my collection
via Flickr https://flic.kr/p/2gfdsoF