Cyanea marksiiCyanea marksii, or Marks' cyanea, is a tree in the bellflower family. It is critically endangered plants|critically endangered] or extinct. The last certain sighting of the species was in 1970.DistributionIt is native to North America and was found on Hawaii.TaxonomyIt was named by Joseph Rock in Occas. Pap. Bernice Pauahi Bishop Mus. 22: 52 in 1957.