The move reflects full recovery of the first two species and significant progress with the third, the US Fish and Wildlife Service said.
The bat, buckwheat and cactus are all found in the Southwest, a hotspot of biodiversity and a locus for habitat protection and other measures undertaken under the US Endangered Species Act for a host of species.
Among these measures, several lesser long-nosed bat maternal colonies in southern Arizona and New Mexico were gated to prevent human disturbance of the springtime homes of thousands of bats, including newborns.
Likewise, some of the gravelly soils and rocky outcrops in southeastern New Mexico that provide habitat for Kuenzler hedgehog cactus were also protected, as were almost-barren gypsum soils nearby that support the gypsum wild buckwheat.
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"The recovery of this amazing flying mammal and these two tenacious plants, along with many other species that recovered over the past eight years, shows the Endangered Species Act is working," said Michael Robinson, a conservation advocate with the Centre for Biological Diversity in the US.
So far 32 species have fully or partially recovered under the administration of the outgoing US President Barack Obama, while another 12 have been proposed as recovered.
This means more species were declared recover under Obama than in all past administrations combined.
Last year marked a milestone in recovery of endangered species through the Endangered Species Act, with more animal and plant species partially or fully recovered than in any previous year.
Four species were proposed for downlisting or delisting, including black-capped vireos, Yellowstone grizzly bears, Florida manatees and Texas' Tobusch fishhook cactus.
This year alone, in addition to the bat, cactus and buckwheat, a California plant, the Hidden Lake bluecurls, was also found to be recovered and proposed for delisting.