In 2000, a new species from the island of Kauai, Tetraplasandra flynnii, was described in Novon.Porter P. Lowry II and Kenneth R. Wood. 2000. "A New, Threatened Species of Tetraplasandra (Araliaceae) from Kauai, Hawaiian Islands, and notes on its conservation status" Novon 10(1):40-44. (See External links below). At that time, it was known from only three individuals. Tetraplasandra lydgatei was resurrected in 2005 in a paper in Pacific Science.Timothy J. Motley. 2005. "Tetraplasandra lydgatei (Araliaceae): taxonomic recognition of a rare endemic species". Pacific Science 59(1):105-110. At that time, it was known from only six individuals on the island of Oahu.
