Delissea rivularis)[3] is a rare species of flowering plant in the bellflower family known by the common name plateau cyanea.

[3] The plant was federally listed as an endangered species of the United States in 1996.

It grows in wet forest habitat, generally next to streams, waterfalls, and plunge pools.

[3][1] Other plants in the habitat include ʻōhiʻa lehua (Metrosideros polymorpha) and uluhe (Dicranopteris linearis), which dominate the canopy, and kanawao (Broussaisia arguta), ʻieʻie (Freycinetia arborea) and ʻaiea (Ilex anomala) in the understory.

[3] This ecosystem is threatened by exotic plant species such as Koster's curse (Clidemia hirta), Kahili ginger (Hedychium gardnerianum), and Santa Barbara daisy (Erigeron karvinskianus).