Orange Hawaiian Flowers Shown here are Hawaiian plants with conspicuous orange flowers. Bougainvillea spp. – Bougainvillea Canna indica – Indian Shot Cordia subcordata – Kou Crassocephalum crepidioides – Redflower Ragleaf Crocosmia × crocosmiiflora – Montbretia Grevillea robusta – Silk Oak 1 of 31>Last