"A sweet-scented essential oil obtained from the flowers of a tropical tree, used in perfumery and aromatherapy", Late 19th century: from Tagalog ilang-ilang.[ylang-ylang etymology, ylang-ylang origin, 英语词源]
"A shrub rose of a variety with grey-green leaves and pinkish-white, sweet-scented flowers", Mid 19th century: from Latin alba, feminine of albus 'white', from the name rosa alba, an old white garden rose.