Portlandia grandiflora L. - Rubiaceae - bellflower, Jamaican tree-lily

Shrub or small tree, up to 6m high, native to Jamaica (and Cuba?), cultivated as ornamental elsewhere; leaves elliptic, acute at apex, acute to obtuse at base; flowers 1 (or 2) per cyme, fragrant, corolla funnelform to broadly funnelform, 10-22cm long, white, sometimes tinged with pink on angles. „This frequently collected, often-cultivated species is the most widespread of the genus. It is distinguished from other species by its very large, white flowers, leafy calyx, and ribbed capsules.“
[Aiello, Annette. „A reexamination of Portlandia (Rubiaceae) and associated taxa.“ Journal of the Arnold Arboretum 60.1 (1979): 38-126]
[Flora of Jamaica, containing descriptions of the flowering plants known from the island by Fawcett, William, 1851-; British Museum (Natural History). Dept. of Botany; Rendle, A. B. (Alfred Barton), 1865-1938 ]
https://archive.org/details/floraofjamaicaco07fawcuoft/page/14/mode/2up

„The flower gives off a strong vanilla scent at night that attracts moths. These moths are known to be the pollinators of this Portlandia species (Burghart 2014)… Portlandia grandiflora is widely planted in gardens as an ornamental because of its beauty and scent.“ https://en.wikipedia.org/wiki/Portlandia_grandiflora

„Portlandia leaves do not have any particular fragrant or scent. However, when ground, they emanate a distinctive aroma.“ Main volatiles (HS-SPME-GC-MS) of grounded P.grandiflora leaves were hexanal (10.3%), E)-2-hexenal (46.3%), linalool (14.7%), borneol (8.6%), and methyl salicylate (9.6%).
[Priestap, Horacio A., et al. „Volatile constituents of five species of Portlandia (Rubiaceae).“ Journal of Essential Oil Research 26.2 (2014): 125-129]

Flowers of Portlandia grandiflora, Huntington Gardens (Los Angeles), United States CC BY-SA 3.0, Author: Raffi Kojian, Source http://Gardenology.org Wikimedia Commons