A Conservation program emphasizing strong physical and biological methods is urgently needed to control the introduced species. Including Three New Species, pp. The endemic species appear to be monophyletic with Malesian affinities. The revision presented here is based upon observations of morphological characters. Sixteen species are recognized, of which three are probably extinct.
Most species have narrow ecological preferences and are endemic to a single island.
Populations previously classified within L. hillebrandii or L. remyi differ in a number of characters not previously evaluated including vestiture, leaf color and venation, pedicel position and color, and calyx shape and color. Three new species, L. iniki, L. pendens, and L. scopulensis , are described. A key to species, species descriptions, and distribution maps are provided. The genus Sadleria is revised. Problems with nomenclature and species descriptions are reviewed and clarified.